Assessing cancer prevention studies--a matter of time.
Drake
Bettina F
BF
Colditz
Graham A
GA
D019587:Dietary Supplements / Q000009:adverse effects; D005492:Folic Acid / Q000009:adverse effects / Q000627:therapeutic use*; D006801:Humans; D009369:Neoplasms / Q000453:epidemiology* / Q000517:prevention & control; D018570:Risk Assessment; D013997:Time Factors; D014805:Vitamin B 12 / Q000009:adverse effects / Q000627:therapeutic use*; D014803:Vitamin B Complex / Q000009:adverse effects / Q000627:therapeutic use*
D014803:Vitamin B Complex; D005492:Folic Acid; D014805:Vitamin B 12