1. Department of Obstetrics & Gynecology, Maastricht University Medical Centre (MUMC+), Maastricht, The Netherlands
2. Department of Clinical Epidemiology and Medical Technology Assessment (KEMTA), Maastricht University Medical Centre(MUMC+), Maastricht, The Netherlands
3. Central Diagnostic Laboratory, Maastricht University Medical Centre (MUMC+), Maastricht, The Netherlands