1. Department of Women's Health, Research Institute for Women's Health, University of Tübingen, Tübingen, Germany.
2. Department of Obstetrics and Gynecology, Ludwig Maximilian University of Munich, Munich, Germany.
3. Department of Obstetrics and Gynecology, University of Basel, Basel, Switzerland.
4. Department of Psychosomatic Medicine and Psychotherapy, University of Tübingen, Tübingen, Germany.
5. Department of Obstetrics and Gynecology, University of Heidelberg, Heidelberg, Germany.