Component

Serum total 25-hydroxyvitamin D concentration

Study-defined Serum total 25-hydroxyvitamin D concentration. Read each linked record for species, exposure and endpoint.

9 recorded relationships. Experimental role, claim status and evidence remain attached to each record.

Read recorded mechanisms Open recursive mind map

How nutrients influence it

Every nutrient with a recorded effect on this component, credited to the nutrient that acted rather than the chapter that recorded it. Open a nutrient to see the findings and the conditions they were measured under.

How nutrients reach it in more than one step

Chains of two or more recorded steps that end here, grouped by the nutrient they start from. Each step is a separate finding, so a chain is a route a mechanism could take, not proof that it does.

Tracing routes…

What it does

Every recorded relationship this component is part of, grouped by its role. Plain wording comes first; the technical statement follows.

Recorded relationships

What acts on it

  1. Measured incremental 25(OH)D AUC through day 28 was 204.7 ng·day/mL for D3 versus 60.2 for D2 (P<0.002); the reported 9.5: 1 ratio instead came from extrapolation to infinite time.

    Cholecalciferol → Serum total 25-hydroxyvitamin D concentration source_derived_draftungraded
    Experimental context and source evidence
    cross_nutrient
    false
    experimental_model
    Human single-dose comparison; 20 healthy men; 28-day follow-up
    exposure
    One oral 50, 000-IU dose of D2 or D3; serial serum measures for 28 days.
    limitations
    Single 50, 000-IU dose in healthy men; biochemical response, not fracture efficacy. Model-extrapolated potency is not a universal IU conversion.
    nutrient_topic
    Vitamin D2 and D3 research collection; topical membership is not evidence of a direct dietary effect. · Vitamin D2 and D3
    organism
    Homo sapiens
    plain_language
    The measured difference and the extrapolated difference are separate results.
    primary_references
    [armas2004] Vitamin D2 is much less effective than vitamin D3 in humans. (2004). https://pubmed.ncbi.nlm.nih.gov/15531486/ DOI: 10.1210/jc.2004-0360
    tissue_or_cell_type
    Human circulating measurements

    Vitamin D2 and D3: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 1249–1260

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Human single-dose comparison; 20 healthy men; 28-day follow-up · source_derived_draft · unverified_draft

    ### vd-armas-auc Measured incremental 25(OH)D AUC through day 28 was 204.7 ng·day/mL for D3 versus 60.2 for D2 (P<0.002); the reported 9.5: 1 ratio instead came from extrapolation to infinite time. Condition category: normal nutrient_topic: Vitamin D2 and D3 research collection; topical membership is not evidence of a direct dietary effect. plain_language: The measured difference and the extrapolated difference are separate results. organism: Homo sapiens tissue_or_cell_type: Human circulating measurements experimental_model: Human single-dose comparison; 20 healthy men; 28-day follow-up limitations: Single 50, 000-IU dose in healthy men; biochemical response, not fracture efficacy. Model-extrapolated potency is not a universal IU conversion. exposure: One oral 50, 000-IU dose of D2 or D3; serial serum measures for 28 days. cross_nutrient: false [armas2004] Vitamin D2 is much less effective than vitamin D3 in humans. (2004). https://pubmed.ncbi.nlm.nih.gov/15531486/ DOI: 10.1210/jc.2004-0360
    Complete structured claim and evidence

  2. Initial total 25(OH)D rises were similar through day 3; D3-associated levels peaked at day 14 while the D2-associated level had returned to baseline by then.

    Cholecalciferol → Serum total 25-hydroxyvitamin D concentration source_derived_draftungraded
    Experimental context and source evidence
    cross_nutrient
    false
    experimental_model
    Human single-dose comparison; 20 healthy men; 28-day follow-up
    exposure
    One oral 50, 000-IU dose of D2 or D3; serial serum measures for 28 days.
    limitations
    Single 50, 000-IU dose in healthy men; biochemical response, not fracture efficacy. Model-extrapolated potency is not a universal IU conversion.
    nutrient_topic
    Vitamin D2 and D3 research collection; topical membership is not evidence of a direct dietary effect. · Vitamin D2 and D3
    organism
    Homo sapiens
    plain_language
    Similar early responses did not mean equally long-lasting blood-level responses.
    primary_references
    [armas2004] Vitamin D2 is much less effective than vitamin D3 in humans. (2004). https://pubmed.ncbi.nlm.nih.gov/15531486/ DOI: 10.1210/jc.2004-0360
    tissue_or_cell_type
    Human circulating measurements

    Vitamin D2 and D3: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 1236–1247

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Human single-dose comparison; 20 healthy men; 28-day follow-up · source_derived_draft · unverified_draft

    ### vd-armas-total25-timecourse Initial total 25(OH)D rises were similar through day 3; D3-associated levels peaked at day 14 while the D2-associated level had returned to baseline by then. Condition category: normal nutrient_topic: Vitamin D2 and D3 research collection; topical membership is not evidence of a direct dietary effect. plain_language: Similar early responses did not mean equally long-lasting blood-level responses. organism: Homo sapiens tissue_or_cell_type: Human circulating measurements experimental_model: Human single-dose comparison; 20 healthy men; 28-day follow-up limitations: Single 50, 000-IU dose in healthy men; biochemical response, not fracture efficacy. Model-extrapolated potency is not a universal IU conversion. exposure: One oral 50, 000-IU dose of D2 or D3; serial serum measures for 28 days. cross_nutrient: false [armas2004] Vitamin D2 is much less effective than vitamin D3 in humans. (2004). https://pubmed.ncbi.nlm.nih.gov/15531486/ DOI: 10.1210/jc.2004-0360
    Complete structured claim and evidence

  3. All three regimens approximately tripled total 25(OH)D; daily D2 versus daily D3 differed by 7% with P=0.82.

    Matched-dose D2 versus D3 comparison → Serum total 25-hydroxyvitamin D concentration source_derived_draftungraded
    Experimental context and source evidence
    availability_state
    biomarker_context Imported condition classification; unverified.
    cross_nutrient
    true
    experimental_model
    Six-week randomized comparison in 40 infants/toddlers with 25(OH)D<20 ng/mL; all prescribed calcium
    exposure
    D2 2000 IU/day, D2 50, 000 IU/week or D3 2000 IU/day for 6 weeks; all also 50 mg/kg/day elemental calcium.
    limitations
    Small pediatric trial; D and calcium effects cannot be separated; biochemical outcomes do not establish long-term comparative safety.
    nutrient_topic
    Vitamin D2 and D3 research collection; topical membership is not evidence of a direct dietary effect. · Vitamin D2 and D3
    organism
    Homo sapiens
    plain_language
    D2 could correct the low marker too in this short pediatric study.
    primary_references
    [gordon2008] Treatment of hypovitaminosis D in infants and toddlers. (2008). https://pubmed.ncbi.nlm.nih.gov/18413426/ DOI: 10.1210/jc.2007-2790
    tissue_or_cell_type
    Human circulating measurements
    trigger_kind
    biomarker_context Imported condition classification; unverified.

    Vitamin D2 and D3: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 1470–1481

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Six-week randomized comparison in 40 infants/toddlers with 25(OH)D<20 ng/mL; all prescribed calcium · source_derived_draft · unverified_draft

    ### vd-gordon-25-response All three regimens approximately tripled total 25(OH)D; daily D2 versus daily D3 differed by 7% with P=0.82. Condition category: biomarker_context nutrient_topic: Vitamin D2 and D3 research collection; topical membership is not evidence of a direct dietary effect. plain_language: D2 could correct the low marker too in this short pediatric study. organism: Homo sapiens tissue_or_cell_type: Human circulating measurements experimental_model: Six-week randomized comparison in 40 infants/toddlers with 25(OH)D<20 ng/mL; all prescribed calcium limitations: Small pediatric trial; D and calcium effects cannot be separated; biochemical outcomes do not establish long-term comparative safety. exposure: D2 2000 IU/day, D2 50, 000 IU/week or D3 2000 IU/day for 6 weeks; all also 50 mg/kg/day elemental calcium. cross_nutrient: true [gordon2008] Treatment of hypovitaminosis D in infants and toddlers. (2008). https://pubmed.ncbi.nlm.nih.gov/18413426/ DOI: 10.1210/jc.2007-2790
    Complete structured claim and evidence

  4. Incremental 12-week 25(OH)D AUC averaged 2136 ng·day/mL for D3 versus 1366 for D2 (P<0.001).

    Cholecalciferol → Serum total 25-hydroxyvitamin D concentration source_derived_draftungraded
    Experimental context and source evidence
    cross_nutrient
    false
    experimental_model
    Single-blind randomized D2/D3 comparison in 33 adults; weekly dosing for 12 weeks
    exposure
    D2 or D3 50, 000 IU orally each week for 12 weeks.
    limitations
    This weekly regimen and marker response do not establish a universal conversion factor or superiority for every clinical endpoint.
    nutrient_topic
    Vitamin D2 and D3 research collection; topical membership is not evidence of a direct dietary effect. · Vitamin D2 and D3
    organism
    Homo sapiens
    plain_language
    D3 produced the larger accumulated blood-marker response during weekly dosing.
    primary_references
    [heaney2011] Vitamin D(3) is more potent than vitamin D(2) in humans. (2011). https://pubmed.ncbi.nlm.nih.gov/21177785/ DOI: 10.1210/jc.2010-2230
    tissue_or_cell_type
    Human circulating measurements

    Vitamin D2 and D3: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 1301–1312

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Single-blind randomized D2/D3 comparison in 33 adults; weekly dosing for 12 weeks · source_derived_draft · unverified_draft

    ### vd-heaney-auc Incremental 12-week 25(OH)D AUC averaged 2136 ng·day/mL for D3 versus 1366 for D2 (P<0.001). Condition category: normal nutrient_topic: Vitamin D2 and D3 research collection; topical membership is not evidence of a direct dietary effect. plain_language: D3 produced the larger accumulated blood-marker response during weekly dosing. organism: Homo sapiens tissue_or_cell_type: Human circulating measurements experimental_model: Single-blind randomized D2/D3 comparison in 33 adults; weekly dosing for 12 weeks limitations: This weekly regimen and marker response do not establish a universal conversion factor or superiority for every clinical endpoint. exposure: D2 or D3 50, 000 IU orally each week for 12 weeks. cross_nutrient: false [heaney2011] Vitamin D(3) is more potent than vitamin D(2) in humans. (2011). https://pubmed.ncbi.nlm.nih.gov/21177785/ DOI: 10.1210/jc.2010-2230
    Complete structured claim and evidence

  5. Mean steady-state total 25(OH)D increments were 45 ng/mL with D3 and 24 ng/mL with D2 (P<0.001).

    Cholecalciferol → Serum total 25-hydroxyvitamin D concentration source_derived_draftungraded
    Experimental context and source evidence
    cross_nutrient
    false
    experimental_model
    Single-blind randomized D2/D3 comparison in 33 adults; weekly dosing for 12 weeks
    exposure
    D2 or D3 50, 000 IU orally each week for 12 weeks.
    limitations
    This weekly regimen and marker response do not establish a universal conversion factor or superiority for every clinical endpoint.
    nutrient_topic
    Vitamin D2 and D3 research collection; topical membership is not evidence of a direct dietary effect. · Vitamin D2 and D3
    organism
    Homo sapiens
    plain_language
    The later steady blood-level rise also differed between the forms.
    primary_references
    [heaney2011] Vitamin D(3) is more potent than vitamin D(2) in humans. (2011). https://pubmed.ncbi.nlm.nih.gov/21177785/ DOI: 10.1210/jc.2010-2230
    tissue_or_cell_type
    Human circulating measurements

    Vitamin D2 and D3: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 1314–1325

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Single-blind randomized D2/D3 comparison in 33 adults; weekly dosing for 12 weeks · source_derived_draft · unverified_draft

    ### vd-heaney-steady-state Mean steady-state total 25(OH)D increments were 45 ng/mL with D3 and 24 ng/mL with D2 (P<0.001). Condition category: normal nutrient_topic: Vitamin D2 and D3 research collection; topical membership is not evidence of a direct dietary effect. plain_language: The later steady blood-level rise also differed between the forms. organism: Homo sapiens tissue_or_cell_type: Human circulating measurements experimental_model: Single-blind randomized D2/D3 comparison in 33 adults; weekly dosing for 12 weeks limitations: This weekly regimen and marker response do not establish a universal conversion factor or superiority for every clinical endpoint. exposure: D2 or D3 50, 000 IU orally each week for 12 weeks. cross_nutrient: false [heaney2011] Vitamin D(3) is more potent than vitamin D(2) in humans. (2011). https://pubmed.ncbi.nlm.nih.gov/21177785/ DOI: 10.1210/jc.2010-2230
    Complete structured claim and evidence

  6. Mean serum total 25(OH)D rose from 16.9 to 26.8 ng/mL with daily D2; the study reported a comparable response to D3, which rose from 19.6 to 28.9 ng/mL.

    Ergocalciferol / vitamin D2 → Serum total 25-hydroxyvitamin D concentration source_derived_draftungraded
    Experimental context and source evidence
    cross_nutrient
    false
    experimental_model
    Double-blind placebo-controlled daily D2/D3/mixed trial; 68 adults represented in Fig.1; 11 weeks
    exposure
    Daily D2 1000 IU, D3 1000 IU, mixed 500+500 IU or placebo; 11 winter weeks.
    limitations
    Small groups and biochemical endpoints; authors reported comparable responses. Daily regimen differs from single-dose and food-fortification studies.
    nutrient_topic
    Vitamin D2 and D3 research collection; topical membership is not evidence of a direct dietary effect. · Vitamin D2 and D3
    organism
    Homo sapiens
    plain_language
    Both forms increased the blood marker in this daily-dose trial.
    primary_references
    [holick2008] Vitamin D2 is as effective as vitamin D3 in maintaining circulating concentrations of 25-hydroxyvitamin D. (2008). https://pubmed.ncbi.nlm.nih.gov/18089691/ DOI: 10.1210/jc.2007-2308
    tissue_or_cell_type
    Human circulating measurements

    Vitamin D2 and D3: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 1262–1273

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Double-blind placebo-controlled daily D2/D3/mixed trial; 68 adults represented in Fig.1; 11 weeks · source_derived_draft · unverified_draft

    ### vd-holick-daily-d2 Mean serum total 25(OH)D rose from 16.9 to 26.8 ng/mL with daily D2; the study reported a comparable response to D3, which rose from 19.6 to 28.9 ng/mL. Condition category: normal nutrient_topic: Vitamin D2 and D3 research collection; topical membership is not evidence of a direct dietary effect. plain_language: Both forms increased the blood marker in this daily-dose trial. organism: Homo sapiens tissue_or_cell_type: Human circulating measurements experimental_model: Double-blind placebo-controlled daily D2/D3/mixed trial; 68 adults represented in Fig.1; 11 weeks limitations: Small groups and biochemical endpoints; authors reported comparable responses. Daily regimen differs from single-dose and food-fortification studies. exposure: Daily D2 1000 IU, D3 1000 IU, mixed 500+500 IU or placebo; 11 winter weeks. cross_nutrient: false [holick2008] Vitamin D2 is as effective as vitamin D3 in maintaining circulating concentrations of 25-hydroxyvitamin D. (2008). https://pubmed.ncbi.nlm.nih.gov/18089691/ DOI: 10.1210/jc.2007-2308
    Complete structured claim and evidence

  7. With the 500-IU D2 plus 500-IU D3 daily combination, mean total 25(OH)D rose from 20.2 to 28.4 ng/mL.

    Matched-dose D2 versus D3 comparison → Serum total 25-hydroxyvitamin D concentration source_derived_draftungraded
    Experimental context and source evidence
    cross_nutrient
    false
    experimental_model
    Double-blind placebo-controlled daily D2/D3/mixed trial; 68 adults represented in Fig.1; 11 weeks
    exposure
    Daily D2 1000 IU, D3 1000 IU, mixed 500+500 IU or placebo; 11 winter weeks.
    limitations
    Small groups and biochemical endpoints; authors reported comparable responses. Daily regimen differs from single-dose and food-fortification studies.
    nutrient_topic
    Vitamin D2 and D3 research collection; topical membership is not evidence of a direct dietary effect. · Vitamin D2 and D3
    organism
    Homo sapiens
    plain_language
    A mixture also raised the marker; this was not a test proving synergy.
    primary_references
    [holick2008] Vitamin D2 is as effective as vitamin D3 in maintaining circulating concentrations of 25-hydroxyvitamin D. (2008). https://pubmed.ncbi.nlm.nih.gov/18089691/ DOI: 10.1210/jc.2007-2308
    tissue_or_cell_type
    Human circulating measurements

    Vitamin D2 and D3: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 1275–1286

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Double-blind placebo-controlled daily D2/D3/mixed trial; 68 adults represented in Fig.1; 11 weeks · source_derived_draft · unverified_draft

    ### vd-holick-mixed With the 500-IU D2 plus 500-IU D3 daily combination, mean total 25(OH)D rose from 20.2 to 28.4 ng/mL. Condition category: normal nutrient_topic: Vitamin D2 and D3 research collection; topical membership is not evidence of a direct dietary effect. plain_language: A mixture also raised the marker; this was not a test proving synergy. organism: Homo sapiens tissue_or_cell_type: Human circulating measurements experimental_model: Double-blind placebo-controlled daily D2/D3/mixed trial; 68 adults represented in Fig.1; 11 weeks limitations: Small groups and biochemical endpoints; authors reported comparable responses. Daily regimen differs from single-dose and food-fortification studies. exposure: Daily D2 1000 IU, D3 1000 IU, mixed 500+500 IU or placebo; 11 winter weeks. cross_nutrient: false [holick2008] Vitamin D2 is as effective as vitamin D3 in maintaining circulating concentrations of 25-hydroxyvitamin D. (2008). https://pubmed.ncbi.nlm.nih.gov/18089691/ DOI: 10.1210/jc.2007-2308
    Complete structured claim and evidence

  8. The D3-biscuit group had a 15.3 nmol/L greater incremental total 25(OH)D change than D2-biscuit (95% CI7.4–23.3; P<0.0003).

    Cholecalciferol → Serum total 25-hydroxyvitamin D concentration source_derived_draftungraded
    Experimental context and source evidence
    cross_nutrient
    false
    experimental_model
    Randomized double-blind five-group food-fortification trial; 335 South Asian and white European women
    exposure
    Daily 15 micrograms D2 or D3 in juice or biscuits versus placebo; 12 winter weeks.
    limitations
    Women aged 20–64 in the UK; food vehicles and dose differ from other trials. Marker superiority is not proof of better disease outcomes.
    nutrient_topic
    Vitamin D2 and D3 research collection; topical membership is not evidence of a direct dietary effect. · Vitamin D2 and D3
    organism
    Homo sapiens
    plain_language
    With matched fortified biscuits, D3 produced a larger marker increase.
    primary_references
    [tripkovic2017] Daily supplementation with 15 μg vitamin D2 compared with vitamin D3 to increase wintertime 25-hydroxyvitamin D status in healthy South Asian and white European women: a 12-wk randomized, placebo-controlled food-fortification trial. (2017). https://pubmed.ncbi.nlm.nih.gov/28679555/ DOI: 10.3945/ajcn.116.138693
    tissue_or_cell_type
    Human circulating measurements

    Vitamin D2 and D3: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 1353–1364

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Randomized double-blind five-group food-fortification trial; 335 South Asian and white European women · source_derived_draft · unverified_draft

    ### vd-tripkovic-biscuit The D3-biscuit group had a 15.3 nmol/L greater incremental total 25(OH)D change than D2-biscuit (95% CI7.4–23.3; P<0.0003). Condition category: normal nutrient_topic: Vitamin D2 and D3 research collection; topical membership is not evidence of a direct dietary effect. plain_language: With matched fortified biscuits, D3 produced a larger marker increase. organism: Homo sapiens tissue_or_cell_type: Human circulating measurements experimental_model: Randomized double-blind five-group food-fortification trial; 335 South Asian and white European women limitations: Women aged 20–64 in the UK; food vehicles and dose differ from other trials. Marker superiority is not proof of better disease outcomes. exposure: Daily 15 micrograms D2 or D3 in juice or biscuits versus placebo; 12 winter weeks. cross_nutrient: false [tripkovic2017] Daily supplementation with 15 μg vitamin D2 compared with vitamin D3 to increase wintertime 25-hydroxyvitamin D status in healthy South Asian and white European women: a 12-wk randomized, placebo-controlled food-fortification trial. (2017). https://pubmed.ncbi.nlm.nih.gov/28679555/ DOI: 10.3945/ajcn.116.138693
    Complete structured claim and evidence

  9. The D3-juice group had a 16.9 nmol/L greater incremental total 25(OH)D change than D2-juice (95% CI9.0–24.8; P<0.0001).

    Cholecalciferol → Serum total 25-hydroxyvitamin D concentration source_derived_draftungraded
    Experimental context and source evidence
    cross_nutrient
    false
    experimental_model
    Randomized double-blind five-group food-fortification trial; 335 South Asian and white European women
    exposure
    Daily 15 micrograms D2 or D3 in juice or biscuits versus placebo; 12 winter weeks.
    limitations
    Women aged 20–64 in the UK; food vehicles and dose differ from other trials. Marker superiority is not proof of better disease outcomes.
    nutrient_topic
    Vitamin D2 and D3 research collection; topical membership is not evidence of a direct dietary effect. · Vitamin D2 and D3
    organism
    Homo sapiens
    plain_language
    The matched-juice comparison also favored D3 for this blood marker.
    primary_references
    [tripkovic2017] Daily supplementation with 15 μg vitamin D2 compared with vitamin D3 to increase wintertime 25-hydroxyvitamin D status in healthy South Asian and white European women: a 12-wk randomized, placebo-controlled food-fortification trial. (2017). https://pubmed.ncbi.nlm.nih.gov/28679555/ DOI: 10.3945/ajcn.116.138693
    tissue_or_cell_type
    Human circulating measurements

    Vitamin D2 and D3: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 1366–1377

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Randomized double-blind five-group food-fortification trial; 335 South Asian and white European women · source_derived_draft · unverified_draft

    ### vd-tripkovic-juice The D3-juice group had a 16.9 nmol/L greater incremental total 25(OH)D change than D2-juice (95% CI9.0–24.8; P<0.0001). Condition category: normal nutrient_topic: Vitamin D2 and D3 research collection; topical membership is not evidence of a direct dietary effect. plain_language: The matched-juice comparison also favored D3 for this blood marker. organism: Homo sapiens tissue_or_cell_type: Human circulating measurements experimental_model: Randomized double-blind five-group food-fortification trial; 335 South Asian and white European women limitations: Women aged 20–64 in the UK; food vehicles and dose differ from other trials. Marker superiority is not proof of better disease outcomes. exposure: Daily 15 micrograms D2 or D3 in juice or biscuits versus placebo; 12 winter weeks. cross_nutrient: false [tripkovic2017] Daily supplementation with 15 μg vitamin D2 compared with vitamin D3 to increase wintertime 25-hydroxyvitamin D status in healthy South Asian and white European women: a 12-wk randomized, placebo-controlled food-fortification trial. (2017). https://pubmed.ncbi.nlm.nih.gov/28679555/ DOI: 10.3945/ajcn.116.138693
    Complete structured claim and evidence

In the sources

Preserved passages that mention this component, quoted exactly. Open one to read it in context.

    This is a research prototype built from draft material. It is not medical advice, and its statements still await verification against the original studies.

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