1. Academic Medical Center; Department of Obstetrics and Gynaecology; Amsterdam Netherlands
2. Academic Medical Center, University of Amsterdam; Department of Clinical Epidemiology, Biostatistics and Bioinformatics; P.O. Box 22700 Amsterdam Netherlands 1100 DE
3. Academic Medical Center Amsterdam; Gynaecology; Meibergdreef 9 Amsterdam Netherlands 1105 AZ
4. The University of Adelaide; Discipline of Obstetrics and Gynaecology, School of Medicine, Robinson Research Institute; Level 3, Medical School South Building Frome Road Adelaide South Australia Australia SA 5005