1Biostatistics and Clinical Epidemiology team (ECSTRA), of the Center of Research on Epidemiology and Biostatistics Sorbonne Paris Cité (CRESS; INSERM UMR 1153), Paris Diderot University, Paris, France, E-mail: sylvie.chevret@paris7.jussieu.fr
3École Nationale de la statistique et de l'analyse de l'information, Rue Blaise Pascal, Rennes, France, E-mail: sylvie.chevret@paris7.jussieu.fr
*Corresponding Author:
Sylvie Chevret, Biostatistics and Clinical Epidemiology team (ECSTRA) of the Center of Research on Epidemiology and Biostatistics Sorbonne Paris Cité (CRESS; INSERM UMR 1153), Paris Diderot University, Paris, France Email: