| Literature DB >> 12265149 |
Abstract
Entities:
Keywords: 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
Mesh：
Year: 1981 PMID： 12265149
Source DB: PubMed Journal: Demografie ISSN： 0011-8265