1. Department of Epidemiology; University of Washington; Seattle WA USA
2. National Center for Tumor Diseases and German Cancer Research Center; Division of Preventive Oncology; Heidelberg Germany
3. Department of Epidemiology; Harvard School of Public Health; Boston MA USA
4. Fred Hutchinson Cancer Research Center; Cancer Prevention Program; Seattle WA USA
5. Department of Medicine; School of Medicine; University of Utah; Salt Lake City UT USA
6. Department of Research; Kaiser Permanente Medical Research Program; Oakland CA USA