Affiliation: | 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. Department of Clinical Epidemiology, University of Groningen, University Medical Centre, Groningen, The Netherlands |