title: Trial of a sequential oral contraceptive (serial 28) in a rural area.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D003276:Contraceptives, Oral / Q000009:adverse effects; D004522:Educational Status; D005260:Female; D006801:Humans; D007194:India; D010298:Parity; D012424:Rural Population
chemical_list: D003276:Contraceptives, Oral