title: Vitamin D and cancer: can we believe the evidence from observational studies?
authors.forename: Nancy R
authors.initials: NR
authors.lastname: Cook
mesh_terms: D005260:Female; D006801:Humans; D008297:Male; D009369:Neoplasms / Q000097:blood* / Q000209:etiology*; D012907:Smoking / Q000009:adverse effects*; D014807:Vitamin D / Q000031:analogs & derivatives* / Q000097:blood
chemical_list: D014807:Vitamin D; C104450:25-hydroxyvitamin D