Source:
American journal of public health [Am J Public Health] 1996 May; Vol. 86 (5), pp. 734-7.Publisher: American Public Health Association Country of Publication: United States NLM ID: 1254074 Publication Model: Print Cited Medium: Print
Source:
American journal of public health [Am J Public Health] 1972 Dec; Vol. 62 (12), pp. 1568-72.Publisher: American Public Health Association Country of Publication: United States NLM ID: 1254074 Publication Model: Print Cited Medium: Print