Multiple births in Southern Moravia.
D001723:Birth Rate; D003604:Czechoslovakia; D005260:Female; D006801:Humans; D007226:Infant Mortality; D007231:Infant, Newborn; D008297:Male; D011247:Pregnancy; D012621:Seasons; D012744:Sex Ratio; D013223:Statistics as Topic; D013997:Time Factors; D014427:Twins