The ovulation method of natural family planning.
D004958:Estradiol / Q000096:biosynthesis; D005193:Family Planning Services; D005260:Female; D005298:Fertility; D005640:Follicle Stimulating Hormone / Q000096:biosynthesis; D006801:Humans; D008598:Menstruation; D008722:Methods; D010060:Ovulation; D011247:Pregnancy
D004958:Estradiol; D005640:Follicle Stimulating Hormone