1. Department of Epidemiology, Centre of Public Health, Medical University of Vienna, Vienna, Austria
2. Department of Gynaecology and Obstetrics, Austrian Cancer Society and Department of Gynaecology and Obstetrics, KH Lainz, Vienna, Austria
3. Austrian Cancer Society and Medical Clinic I, Institute of Cancer Research, Medical University of Vienna, Austria
4. Department of Epidemiology, Centre of Public Health, Medical University of Vienna, Borschkegasse 8a, A-1090 Vienna, Austria