title: Does nature know best? Background and mechanisms of natural family planning.
authors.forename: C
authors.initials: C
authors.lastname: Norman
mesh_terms: D000465:Algorithms; D000568:Amenorrhea / Q000503:physiopathology*; D001721:Birth Intervals; D001942:Breast Feeding; D005260:Female; D006801:Humans; D012252:Natural Family Planning Methods