1. Department of Medical Sciences, Section of Orthopedics, Örebro University, 701 85 Örebro, Sweden
2. Department of Orthopedic Surgery, Aarhus University Hospital, Palle Juul-Jensens Blvd. 99, 8200 Aarhus, Denmark
3. Department of Radiology, Aarhus University Hospital, Palle Juul-Jensens Blvd. 99, 8200 Aarhus, Denmark