1. UNC Lineberger Comprehensive Cancer Center and the Department of Nutrition, School of Public Health, University of North Carolina, Chapel Hill, North Carolina 27599-7461;
2. Department of Health Behavior and Health Education, School of Public Health University of North Carolina, Chapel Hill, North Carolina 27599;
3. Comprehensive Cancer Center and School of Public Health, University of Michigan, Ann Arbor, Michigan 48109-2029;
4. Comprehensive Cancer Center and School of Public Health, University of Michigan, Ann Arbor, Michigan 48109;
5. Department of Nutrition, School of Public Health, University of North Carolina, Chapel Hill, North Carolina 27599-7461;
6. Department of Health Behavior, School of Public Health, University of Alabama at Birmingham, Birmingham, Alabama 35294-0022;