Association between period of gestation and length of menstrual cycle.
D005260:Female; D006801:Humans; D008597:Menstrual Cycle; D008598:Menstruation; D011247:Pregnancy
MENSTRUATION; PREGNANCY
Br Med J. 1949 May 7;1(4609):803-5
18120851
Science. 1929 Nov 8;70(1819):453-4
17758215