1. Department of Obstetrics and Gynecology, University of Bern, Bern, Switzerland
2. Department of Obstetrics and Gynecology, University Medical Center Mainz, Mainz, Germany
3. Department of Obstetrics and Gynecology, McGill University, Montreal, Canada
4. Medical Library, University Library Bern, University of Bern, Switzerland
5. Cochrane Metabolic and Endocrine Disorders Group, Institute of General Practice (ifam), Medical Faculty of the Heinrich-Heine-University Düsseldorf, Düsseldorf, Germany
6. movos AG, Zürich, Switzerland
7. Department of Gynecology and Obstetrics, University Hospital, Münster, Germany