title: Outcome of pregnancy in users of natural family planning.
authors.affiliation: Johns Hopkins School of Hygiene and Public Health, Baltimore.
authors.forename: R
authors.initials: R
authors.lastname: Kambic
authors.forename: R H
authors.initials: RH
authors.lastname: Gray
authors.forename: J L
authors.initials: JL
authors.lastname: Simpson
mesh_terms: D000818:Animals; D005193:Family Planning Services / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D010063:Ovum / Q000502:physiology; D011247:Pregnancy; D011256:Pregnancy Outcome; D013094:Spermatozoa / Q000502:physiology