Am J Public Health Nations Health. 1969 Oct;59(10):1793-5. doi: 10.2105/ajph.59.10.1793.
American journal of public health and the nation's health
[No authors listed]
PMID: 5388005 PMCID: PMC1226714 DOI: 10.2105/ajph.59.10.1793 Free PMC Article
[No abstract available.]