1. University Medical Center Groningen, University of Groningen; Obstetrics & Gynecology CB30; Hanzeplein 1 P.O. Box 30.001 Groningen Netherlands 9700 RB
2. University Medical Center Groningen, University of Groningen; Hanzeplein 1 P.O.Box 30.001 Groningen Netherlands 9700 RB
3. University Medical Center Groningen, University of Groningen; Department of Surgery. Translational Surgical Oncology; Hanzeplein 1/BA44 Groningen Netherlands 9713 GZ
4. University Medical Center Groningen, University of Groningen; Unit Chronic Airway Diseases, Department of Epidemiology; Triade gebouw, E3.29 P.O.Box 30.001 Groningen Netherlands 9700 RB
5. Isala Clinics, Location Sophia; Department of Obstetrics & Gynaecology; Dr van Heesweg 2 P O Box 10400 Zwolle Netherlands 3515 BE
6. Leiden University Medical Center; Department of Immunohaematology and Blood Transfusion; PO Box 9600 E3-Q Leiden Netherlands 2300 RC