1. Departments of Obstetrics and Gynecology, Internal Medicine and Pathology, University of Innsbruck, Austria
2. Department of Obstetrics and Gynecology, University of Mainz, Germany
3. Department of Obstetrics and Gynecology, Innsbruck University Hospital, Anichstrasse 35, A‐6020 Innsbruck Austria. Fax: 43 512 504 3112