title: The calendar vs. cervical mucus.
authors.forename: J
authors.initials: J
authors.lastname: Sreenivasan
mesh_terms: D003267:Contraception; D003268:Contraception Behavior / Q000706:statistics & numerical data; D005193:Family Planning Services / Q000379:methods; D005260:Female; D006801:Humans; D012252:Natural Family Planning Methods; D010061:Ovulation Detection; D011247:Pregnancy