title: Sequential pills, rarely used in developing world, are withdrawn in U.S. because of cancer risk.
mesh_terms: D000328:Adult; D000367:Age Factors; D003276:Contraceptives, Oral / Q000009:adverse effects*; D003279:Contraceptives, Oral, Sequential / Q000009:adverse effects*; D005193:Family Planning Services; D005260:Female; D006801:Humans; D008593:Menopause; D008875:Middle Aged; D014594:Uterine Neoplasms / Q000139:chemically induced*
chemical_list: D003276:Contraceptives, Oral; D003279:Contraceptives, Oral, Sequential