1. Department of Clinical Epidemiology, Department of Clinical MedicineAarhus University Hospital Aarhus Denmark
2. Department of Neurology, Department of Clinical MedicineAarhus University Hospital Aarhus Denmark
3. National Center of Register‐based Research, Department of Economics and Business Economics, Business and Social ScienceAarhus University Aarhus Denmark
4. Department of Obstetrics and Gynecology, Department of Clinical MedicineAarhus University Hospital Aarhus Denmark
5. Research Unit of Gynecology and Obstetrics, Institute of Clinical ResearchUniversity of Southern Denmark Odense Denmark
6. Department of Obstetrics and GynecologyOdense University Hospital Odense Denmark
7. Department of Primary Care and Population HealthUniversity College London London UK
8. Department of Epidemiology, Fielding School of Public HealthUniversity of California, Los Angeles (UCLA) Los Angeles California USA