Knutsen, Gunnar MD1; Drogset, Jon Olav MD, PhD2; Engebretsen, Lars MD, PhD3; Grøntvedt, Torbjørn MD, PhD2; Isaksen, Vidar MD1; Ludvigsen, Tom C. MD3; Roberts, Sally PhD4; Solheim, Eirik MD, PhD5; Strand, Torbjørn MD5; Johansen, Oddmund MD, PhD1
1 Department of Orthopaedic Surgery, University of Tromsø, University Hospital North Norway, 9038 Tromsø, Norway. E-mail address for G. Knutsen: [email protected]
2 University of Trondheim, Trondheim University Hospital, 7006 Trondheim, Norway
3 Department of Orthopaedic Surgery, University of Oslo, Ullevål University Hospital, 0407 Oslo, Norway
4 Robert Jones and Agnes Hunt Orthopaedic Hospital, Oswestry, Shropshire SY10 7AG, United Kingdom
5 Deaconess University Hospital Bergen, 5009 Bergen, Norway