title: Measuring the contraceptive efficacy of Persona.
authors: Woodrow Wilson School of Public and International Affairs, and Office of Population Research, Wallace Hall, Princeton University, Princeton, NJ 08544, USA. trussell@princeton.edu
authors: J
authors: J
authors: Trussell
mesh_terms: D005260:Female; D006728:Hormones / Q000652:urine*; D006801:Humans; D012252:Natural Family Planning Methods; D010061:Ovulation Detection / Q000295:instrumentation*; D011247:Pregnancy
chemical_list: D006728:Hormones