[1] Dept. of Biomaterials/Handicap Res., Institute for Surgical Sciences, University of Gothenburg, Gothenburg, Sweden
[2] Department of Orthopaedics, Institute for Surgical Sciences, University of Gothenburg, Gothenburg, Sweden
[3] Dept. of Biomaterials/Handicap Res., Box 412, SE 405 30 Göteborg, Sweden