1. Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, Maryland, USA
2. Southwest Research Institute, San Antonio, Texas, USA
3. Fred Hutchinson Cancer Research Center and the University of Washington, Seattle, Washington, USA
4. Mayo Clinic, College of Medicine, Rochester, Minnesota, USA
5. Karmanos Cancer Institute and Department of Family Medicine, Wayne State University, Detroit, Michigan, USA
6. Department of Preventive Medicine, Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, California, USA