- Correspondence to Professor Teppo L N Järvinen, Department of Orthopaedics and Traumatology, University of Helsinki and Helsinki University Hospital, Töölö Hospital, Topeliuksenkatu 5, Helsinki 00260, Finland;
- Received 19 January 2017
- Revised 3 April 2017
- Accepted 13 April 2017
- Published online 12 January 2018.
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