1. INSERM, IAME, UMR 1137, F-75018, Paris, France
2. University Paris Diderot, Sorbonne Paris Cité, F-75018, Paris, France
3. Faculty of Pharmacy, University of Lille, EA 2694, Public Health: Epidemiology and Healthcare quality, F-59000 Lille, France
4. Statistical Methodology Group, Biostatistics and Programming department, Sanofi-Aventis R&D, Chilly-Mazarin, France