1. Gastrointestinal Malignancy Section Thoracic and Gastrointestinal Malignancies Branch Center for Cancer Research National Cancer InstituteNational Institutes of Health Bethesda MDUSA
2. Division of Cancer Epidemiology and Genetics National Cancer InstituteNational Institutes of Health Bethesda MDUSA
3. Information Management Services Inc. Calverton MDUSA
4. Slone Epidemiology Center Boston University Boston MAUSA
5. Division of Cardiovascular Science National Heart, Lung and Blood InstituteNational Institutes of Health Bethesda MDUSA