title: The progestin-only pills and the levonorgestrel-releasing IUD: two progestin-only contraceptives.
authors.affiliation: Family Health International Research Triangle Park, North Carolina 27709, USA.
authors.forename: I C
authors.initials: IC
authors.lastname: Chi
mesh_terms: D000284:Administration, Oral; D002986:Clinical Trials as Topic; D003271:Contraceptive Agents, Female / Q000008:administration & dosage / Q000009:adverse effects / Q000592:standards*; D005260:Female; D006801:Humans; D007436:Intrauterine Devices, Medicated / Q000009:adverse effects / Q000592:standards*; D016912:Levonorgestrel / Q000008:administration & dosage / Q000009:adverse effects / Q000592:standards*; D011247:Pregnancy; D018873:Pregnancy Rate; D045167:Progesterone Congeners / Q000008:administration & dosage / Q000009:adverse effects / Q000592:standards*
chemical_list: D003271:Contraceptive Agents, Female; D045167:Progesterone Congeners; D016912:Levonorgestrel