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