1 CEReSS - Health Service Research and Quality of Life Center, UR3279, Aix-Marseille University, Marseille, France. Electronic address: laurent.boyer@ap-hm.fr.
2 CEReSS - Health Service Research and Quality of Life Center, UR3279, Aix-Marseille University, Marseille, France.
3 CEReSS - Health Service Research and Quality of Life Center, UR3279, Aix-Marseille University, Marseille, France; Department of General Practice, Aix-Marseille University, Marseille, France.
4 Department of Clinical Epidemiology, Grenoble University Hospital, Grenoble Alps University, Grenoble, France; O'Brien Institute for Public Health, University of Calgary, Calgary, Alberta, Canada.
5 Johns Hopkins University School of Medicine, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA.