title: [Survey of menstrual cycle length and ovulation in healthy women in Beijing].
authors.forename: B L
authors.initials: BL
authors.lastname: Xiao
mesh_terms: D000293:Adolescent; D000328:Adult; D002681:China; D005260:Female; D006801:Humans; D008597:Menstrual Cycle; D010060:Ovulation; D011374:Progesterone / Q000097:blood; D011446:Prospective Studies
chemical_list: D011374:Progesterone