1. Division of Haemostasis and Thrombosis; Department of Haematology; University of Groningen University Medical Centre Groningen; Groningen The Netherlands
2. Department of Obstetrics and Gynaecology; University of Groningen University Medical Centre Groningen; Groningen The Netherlands
3. Isala Clinics Department of Obstetrics and Gynaecology; Zwolle The Netherlands