1. Department of Osteoporosis, Inselspital Bern University Hospital, Bern, Switzerland.
2. Department of Orthopaedic Surgery, and Inselspital Bern University Hospital, Bern, Switzerland.
3. Department of Plastic and Hand Surgery, Inselspital Bern University Hospital, Bern, Switzerland.
4. Department of Orthopaedic Surgery, School of Medicine, University of Zagreb, Zagreb, Croatia.