1. Division of Cancer Epidemiology and Genetics, National Cancer Institute , Rockville, MD, USA
2. The Institute of Cancer Research, London, England, UK
3. Southwest Center, Pacific Institute for Research and Evaluation , Albuquerque, NM, USA
4. Division of Intramural Research, National Institute on Minority Health and Health Disparities , Bethesda, MD, USA
5. Division of Intramural Research, National Heart, Lung, and Blood Institute , Bethesda, MD, USA
6. Department of Radiation Oncology, Stanford Cancer Institute , Stanford, CA, USA