| Literature DB >> 4114213 |
Abstract
Keywords: Age Factors; Basal Body Temperature Method--side effects; Biology; Chromosome Abnormalities--etiology; Delivery Of Health Care; Demographic Factors; Diseases; Epidemiologic Methods; Family Planning; Family Planning, Behavioral Methods; Genetics; Health; Health Services; Maternal Age; Maternal Health Services; Maternal-child Health Services; Natural Family Planning; Neonatal Diseases And Abnormalities; Parental Age; Population; Population Characteristics; Pregnancy, Unplanned; Pregnancy, Unwanted; Primary Health Care; Reproduction; Research Methodology
Mesh：
Year: 1972 PMID： 4114213 DOI： 10.1016/s0140-6736(72)91640-6
Source DB: PubMed Journal: Lancet ISSN： 0140-6736 Impact factor: 79.321