1. University Medical Center Groningen (UMCG); Obstetrics & Gynaecology; Groningen Netherlands 9713 GZ
2. University Medical Center Groningen (UMCG); Groningen Netherlands 9713 GZ
3. University Medical Center Groningen (UMCG); Department of Surgery. Translational Surgical Oncology; Groningen Netherlands 9713 GZ
4. University Medical Center Groningen (UMCG); Unit Chronic Airway Diseases, Department of Epidemiology; Groningen Netherlands 9713 GZ
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