M Kelly-Irving1,2, C Delpierre3,4, M Richter5. 1. INSERM, UMR1027, Toulouse, France. 2. Université Toulouse III Paul-Sabatier, Toulouse, France. 3. INSERM, UMR1027, Toulouse, France. cyrille.delpierre@inserm.fr. 4. Université Toulouse III Paul-Sabatier, Toulouse, France. cyrille.delpierre@inserm.fr. 5. Medical Faculty, Institute of Medical Sociology (IMS), Martin Luther University Halle-Wittenberg, Halle, Germany.