- 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 22 August 2016
- Revised 21 December 2016
- Accepted 3 January 2017
- Published online 14 March 2017.
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