1. Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden.
2. Research and Development, Norrtälje Hospital, Tiohundra AB, Norrtälje, Sweden.
3. Department of Clinical Sciences, Danderyd Hospital, Karolinska Institutet, Stockholm, Sweden.
4. Department of Orthopedic Surgery, Karolinska University Hospital, Stockholm, Sweden.