- Correspondence to Professor Jean-François Viel, INSERM-IRSET, Department of Epidemiology and Public Health, University Hospital, 2, rue Henri Le Guilloux, Rennes 35033, France;
- Received August 22, 2016
- Revised December 21, 2016
- Accepted January 3, 2017
- First published March 1, 2017.
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