1. University of Oslo, Departments of Orthopedics at Ullevål Hospital, N-0407, Oslo, Norway, Tel +47-2-11 95 00, Fax +47-2-11 95 58
2. University of Oslo, Departments of Radiology at Ullevål Hospital, N-0407, Oslo, Norway, Tel +47-2-11 95 00, Fax +47-2-11 95 58