2Department of Clinical Radiology, Diagnostic Imaging Center, Kuopio University Hospital, POB 100, 70029 Kuopio, Finland
3Department of Orthopaedics, Traumatology and Hand Surgery, Kuopio University Hospital, POB 100, FIN-70029 Kuopio, Finland
4Department of Medical Physics, Central Finland Central Hospital, Keskussairaalantie 19, FIN-40620 Jyväskylä, Finland
5Department of Biomedical Engineering,
Lund University, BMC D13, 221 84 Lund, Sweden
6Turku Bioscience Centre,
University of Turku and Åbo Akademi University, Tykistökatu 6, FIN-20520 Turku, Finland