[ON THE PROBLEM OF SEASONAL FLUCTUATIONS IN THE DATES OF BIRTH AND CONCEPTION].
D036861:Delivery, Obstetric; D005260:Female; D005306:Fertilization; D005858:Germany; D005860:Germany, West; D006801:Humans; D036801:Parturition; D010507:Periodicity; D011247:Pregnancy; D012621:Seasons
DELIVERY; FERTILIZATION; GERMANY, WEST; PERIODICITY; PREGNANCY; SEASONS