Affiliation: | 1. Health Services Research Scientist, Bassett Healthcare Network, Research Institute, Cooperstown, NY;2. Assistant Professor of Pediatrics, Columbia University College of Physicians & Surgeons, Cooperstown, NY;3. Biostatistics and Computing Center, Bassett Healthcare Network, Research Institute, Cooperstown, NY;4. Department of Epidemiology, Columbia University Mailman School of Public Health, Cooperstown, New York |