Am J Public Health Nations Health. 1961 Apr;51(4):596. doi: 10.2105/ajph.51.4.596-a.
American journal of public health and the nation's health
[No authors listed]
PMID: 18017839 PMCID: PMC1522337 DOI: 10.2105/ajph.51.4.596-a
[No abstract available.]