- 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 November 22, 2016
- Revised March 15, 2017
- Accepted March 20, 2017
- First published May 22, 2017.
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