1. Institute for Prevention and Cancer Epidemiology, Faculty of Medicine and Medical Center University of Freiburg Freiburg Germany
2. German Cancer Consortium (DKTK) Freiburg Germany
3. German Cancer Research Center (DKFZ) Heidelberg Germany
4. Obstetrics and Gynecology Epidemiology Center, Department of Obstetrics, Gynecology and Reproductive Biology Brigham and Women's Hospital, Harvard Medical School Boston Massachusetts USA
5. Institute of Medical Bioinformatics and Systems Medicine (IBSM), Medical Center – University of Freiburg, Faculty of Medicine University of Freiburg Freiburg Germany
6. Department of Epidemiology Fielding School of Public Health, University of California Los Angeles California USA