1. Department of Obstetrics and Gynecology; Aarhus University Hospital; Aarhus Denmark
2. Department of Clinical Medicine; Aarhus University; Aarhus Denmark
3. Department of Orthopaedic Surgery; Randers Regional Hospital; Randers Denmark
4. Department of Obstetrics and Gynecology; Odense University Hospital; Odense Denmark
5. Department of Clinical Research; University of Southern Denmark; Odense Denmark