1. Department of Obstetrics and Gynaecology Maastricht University Medical Centre Maastricht The Netherlands
2. Department of Clinical Epidemiology and Medical Technology Assessment Maastricht University Medical Centre Maastricht The Netherlands
3. Department of Obstetrics and Gynaecology Radboud University Medical Centre Nijmegen The Netherlands
4. Department of Cardiology Maastricht University Medical Centre Maastricht The Netherlands