1. Cancer Epidemiology Program, University of Hawaii Cancer Center, Honolulu, HI
2. Division of Biostatistics and Epidemiology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH
3. Departments of Obstetrics, Gynecology, and Pediatrics, Dalhousie University, Halifax, NS, Canada
4. Department of Preventive Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA