title: Letter: liver tumors and oral contraceptives.
mesh_terms: D006528:Carcinoma, Hepatocellular / Q000139:chemically induced*; D003276:Contraceptives, Oral / Q000009:adverse effects*; D005260:Female; D006801:Humans; D008113:Liver Neoplasms / Q000139:chemically induced*
chemical_list: D003276:Contraceptives, Oral