- Correspondence to Professor Jean-Yves Reginster, Department of Public Health, Epidemiology and Health Economics, Liège State University, Liège, Belgium, Quartier Hôpital – CHU B23, venue Hippocrate, 13 , 4000 Liège, Belgium;
- Received 22 November 2016
- Revised 15 March 2017
- Accepted 20 March 2017
- Published online 22 May 2017.
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