title: Levels of epidemiologic proof in studies of diet and cancer with special reference to dietary fat and vitamin A.
authors.affiliation: Roswell Park Memorial Institute, Buffalo, New York 14263.
authors.forename: C
authors.initials: C
authors.lastname: Mettlin
mesh_terms: D004032:Diet; D004041:Dietary Fats / Q000008:administration & dosage / Q000009:adverse effects*; D006801:Humans; D009369:Neoplasms / Q000209:etiology / Q000517:prevention & control; D012307:Risk Factors; D014801:Vitamin A / Q000008:administration & dosage*
chemical_list: D004041:Dietary Fats; D014801:Vitamin A