- Correspondence to Dr Cecilie Piene Schrøder, Orthopedic Department, Lovisenberg Diaconal Hospital, Lovisenberggt 17, 0440 Oslo, Norway;
- Accepted 10 March 2017
- Published in print 1 December 2017.
- Published online 16 November 2017.
- Published first 11 May 2017.
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