1. University of Gothenburg, Sahlgrenska Academy, Institute of Clinical Sciences, Department of Hand Surgery, Gothenburg, Sweden
2. Department of Surgery and Orthopaedics, Alingsås lasarett, Alingsås, Sweden
3. Department of Surgery and Orthopaedics, Kungälvs sjukhus, Kungälv, Sweden
4. Department of Hand Surgery, Sahlgrenska University Hospital, Mölndal, Sweden