1. Department of Epidemiology; Mailman School of Public Health, Columbia University; New York New York
2. Herbert Irving Comprehensive Cancer Center; College of Physicians and Surgeons of Columbia University; New York New York
3. Division of Research; Kaiser Permanente; Oakland California
4. Department of Medicine; College of Physicians and Surgeons of Columbia University; New York New York
5. Division of Behavioral and Communication Sciences; Department of Clinical Sciences, University of Texas Southwestern Medical Center; Dallas Texas
6. Cancer Research Network; National Cancer Institute; Bethesda Maryland