Christian Dagenais1, Valéry Ridde2. 1. Department of Psychology, University of Montreal, Montreal, Canada. Electronic address: christian.dagenais@umontreal.ca. 2. IRD (French Institute for Research on Sustainable Development), CEPED (IRD Université Paris Descartes), Université Paris Sorbonne Cités, ERL INSERM SAGESUD, Marseille, France; University of Montreal Public Health Research Institute (IRSPUM), Montreal, Canada.