1. Gynecology, University Hospital Zurich, Zurich, Switzerland
2. Gynecologic Endocrinology and Reproductive Medicine, Inselspital University Hospital Bern, Bern, Switzerland
3. Epidemiology, Biostatistics and Prevention Institute, University of Zurich, Zurich, Switzerland
4. Center for perioperative thrombosis and hemostasis, University of Zurich, Zurich, Switzerland
5. Obstetrics, University Hospital Zurich, Zurich, Switzerland
6. Acute Gynecology, Early Pregnancy & Advanced Endoscopic Surgery Unit, University of Sydney - Sydney Medical School Nepean, Sydney, Australia
7. Gynecology, Research Institute of the McGill University Health Centre, Montreal, Canada