title: Obstetrics and gynecology.
authors.affiliation: Johns Hopkins University School of Medicine, Baltimore, Md.
authors.forename: G R
authors.initials: GR
authors.lastname: Huggins
authors.forename: A C
authors.initials: AC
authors.lastname: Wentz
mesh_terms: D003271:Contraceptive Agents, Female; D005260:Female; D005307:Fertilization in Vitro; D006176:Gynecology; D006801:Humans; D007231:Infant, Newborn; D016912:Levonorgestrel; D009644:Norgestrel; D009774:Obstetrics; D011247:Pregnancy; D012127:Respiratory Distress Syndrome, Newborn / Q000517:prevention & control
chemical_list: D003271:Contraceptive Agents, Female; D009644:Norgestrel; D016912:Levonorgestrel