- Correspondence to Ida Svege, Department of Orthopaedics, Oslo University Hospital, Seksjon for forskning og kompetansesenter, Kirkeveien 166, bygg 72 (2. etg), Oslo 0407, Norway;
- Received March 15, 2013
- Revised September 4, 2013
- Accepted October 26, 2013
- First published November 19, 2013.
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