1. Division of Cancer Epidemiology; German Cancer Research Center (DKFZ); Heidelberg Germany
2. Department for Health Evidence; Radboud University Medical Centre; Nijmegen The Netherlands
3. Institute of Epidemiology; German Research Center for Environmental Health; Munich Germany
4. Department of Cancer Epidemiology/Clinical Cancer Registry; University Cancer Center Hamburg (UCCH) and Department of Medical Biometrics and Epidemiology, University Medical Center Hamburg-Eppendorf; Hamburg Germany