1. Department of Environmental Health Sciences School of Public Health University of Minnesota Minneapolis MN United States of America
2. Department of Medicine Division of Hematology, Oncology and Transplantation University of Minnesota Minneapolis MN United States of America
3. Department of Epidemiology Norris Cotton Cancer Center Geisel School of Medicine at Dartmouth Hanover NH United States of America
4. Division of Epidemiology and Community Health School of Public Health
5. Masonic Cancer Center University of Minnesota Minneapolis MN United States of America