[Prenatal human sex ratios].
Rychtarikova
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D003604:Czechoslovakia; D003710:Demography; D019049:Developed Countries; D005060:Europe; D005061:Europe, Eastern; D005333:Fetus; D011153:Population; D011154:Population Characteristics; D011247:Pregnancy; D015203:Reproducibility of Results; D012098:Reproduction; D012099:Reproductive Techniques; D017678:Sex Distribution; D012737:Sex Factors; D012743:Sex Preselection; D012744:Sex Ratio; D013223:Statistics as Topic
Czechoslovakia; Demographic Factors; Developed Countries; Eastern Europe; Estimation Technics; Europe; Fetus; Population; Population Characteristics; Pregnancy; Reliability; Reproduction; Reproductive Technologies; Sex Distribution; Sex Factors; Sex Preselection; Sex Ratio