1. Department of Environmental Health Sciences and Yale School of Public Health, New Haven, Connecticut, USA.
2. Section of Surgical Outcomes and Epidemiology, Department of Surgery, Yale School of Medicine, New Haven, Connecticut, USA.
3. Department of Chronic Disease Epidemiology, Yale School of Public Health, New Haven, Connecticut, USA.
4. Center for Genetic Epidemiology, Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, California, USA.
5. Department of Epidemiology, School of Public Health, University of California Berkeley, Berkeley, California, USA.