1. Department of Orthopedic Surgery, Hvidovre University Hospital, Kettegaard Allé 30, 2650 Hvidovre, Denmark
2. AO Research Institute Davos, Clavadelerstrasse 8, 7270 Davos, Switzerland
3. Department of Orthopedic Surgery, Gentofte Hospital, Gentofte Hospitalsvej 1, 2900 Hellerup, Denmark
4. Department of Orthopedic Surgery, Rigshospitalet, Copenhagen University Hospital, Blegdamsvej 9, 2100 Copenhagen, Denmark
5. Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Brinellvägen 8, 10044 Stockholm, Sweden
6. Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3B, 2200 Copenhagen, Denmark