1. Department of Social and Preventive Medicine, University at Buffalo, Buffalo, New York.
2. School of Medicine, Johns Hopkins University, Baltimore, Maryland.
3. Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland.
4. Center for Urban Epidemiologic Studies, The New York Academy of Medicine, New York, New York.
5. Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire.
6. School of Medicine, Tufts University, Boston, Massachusetts.