1. Department of Surgery, Tampere University Hospital, Tampere
2. Medical School and the Institute of Medical Technology, University of Tampere, Tampere
3. Accident and Trauma Research Center and the Tampere Research Center of Sports Medicine, UKK Institute, Tampere, Finland
4. Tohtoritalo 41400 Hospital, Turku, Finland
5. Department of Surgery, Oulu University Hospital, Oulu, Finland