| web | http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1470496/ |
| author | Martha N. Gardner, PhD and Allan M. Brandt, PhD |
| publication | Am J Public Health |
| date | 2006-02-01 |
| web | Magazine of Wall Street | 1930-07-26 | ||
| web | Saturday Evening Post | 1937-10-16 | ||
| web | Ohio State Journal of Medicine | 1949-07-01 |
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