1. Research Unit of Obstetrics and Gynecology, Department of Clinical Research, University of Southern Denmark, Odense, Denmark
2. Open Patient Data Explorative Network (OPEN), Department of Clinical Research, University of Southern Denmark and Odense University Hospital, Odense, Denmark
3. MTEK Sciences Inc, Vancouver, British Columbia, Canada
4. Department of Epidemiology Research, Statens Serum Institute, Copenhagen, Denmark
5. Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus, Denmark