1. Department of Medicine; Institute of Clinical Medicine, University of Helsinki, and Helsinki University Central Hospital; Helsinki Finland
2. Department of Natural and Medical Subjects; Faculty of Health Sciences, University of Primorska; Izola Slovenia
3. Orthopaedic Research Laboratories, Department of Orthopaedic Surgery; Stanford University School of Medicine; Stanford California
4. ORTON Orthopaedic Hospital of the Invalid Foundation; Helsinki Finland
5. Institute of Biomedicine, Anatomy; University of Helsinki; Helsinki Finland