1. Jeroen Bosch Hospital; Department of Obstetrics and Gynaecology; Henri Dunantstraat 1, PO Box 90153 's-Hertogenbosch Netherlands 5200 ME
2. Academic Medical Center, University of Amsterdam; Center for Reproductive Medicine; Meibergdreef 9 Amsterdam Netherlands 1105 AZ
3. Isala Clinics, Location Sophia; Department of Obstetrics & Gynaecology; Dr van Heesweg 2 P O Box 10400 Zwolle Netherlands 3515 BE