| web | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1446866/ |
| author | Jonathan M. Samet, MD, MS and Thomas A. Burke, PhD, MPH |
| publication | Am J Public Health |
| date | 2001-11-01 |
| web | E K Ong, S A Glantz | Am J Public Health | 2001-11-01 |
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