- Correspondence to Robin Christensen, Biostatistician Professor of clinical epidemiology, adj Head of Musculoskeletal Statistics Unit, The Parker Institute,Bispebjerg and Frederiksberg Hospital, Nordre Fasanvej 57DK-2000 Copenhagen Frederiksberg, Denmark;
- Received March 15, 2017
- Revised May 29, 2017
- Accepted July 1, 2017
- First published September 2, 2017.
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