1. New York City Department of Health and Mental Hygiene, New York, New York, USA
2. Department of Biostatistics, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA
3. Department of Epidemiology, and
4. Department of Obstetrics and Gynecology, Brown University, Providence, Rhode Island, USA
5. Department of Occupational and Environmental Health, University of Pittsburgh Graduate School of Public Health, Pittsburgh, Pennsylvania, USA
6. ZevRoss Spatial Analysis, Ithaca, New York, USA