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Thomas B. Richards, MD,is a Medical Officer with the Public Health Practice Program Office of the Centers for Disease Control and Prevention in Atlanta, Georgia. Charles M. Croner, PhD,is Editor of Public Health GIS News and Information, and a Geographer/Statistician with the Office of Research and Methodology, National Center for Health Statistics, Centers for Disease Control and Prevention in Hyattsville, Maryland. Lloyd F. Novick, MD, MPH,is Editor of Journal of Public Health Management and Practice, Commissioner of Onondaga County Department of Health, and Professor, Department of Medicine, SUNY Health Science Center, Syracuse, New York. Use of trade names and commercial sources is for identification only and does not imply endorsement by the Public Health Service or by the U.S. Department of Health and Human Services.
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Richards et al. (1999) studied this question.
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