Obstetrics and gynecology.
Huggins
G R
GR
Johns Hopkins University School of Medicine, Baltimore, Md.
Wentz
A C
AC
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
D003271:Contraceptive Agents, Female; D009644:Norgestrel; D016912:Levonorgestrel