Alexis Descatha1, Thomas Despréaux1, Ryan P Calfee2, Bradley Evanoff3, Olivier Saint-Lary4. 1. AP-HP, Occupational Health Unit/EMS (Samu92), University hospital of Poincaré site, France Versailles St-Quentin University UVSQ Inserm, UMS 011 - UMR-S 1168, France. 2. Department of Orthopedic Surgery, Washington University School of Medicine, St Louis, Missouri, USA. 3. Institute of Clinical and Translational Sciences/ Division of General Medical Sciences, Washington University School of Medicine, St Louis, Missouri, USA. 4. Université Versailles Saint-Quentin en Yvelines, Faculty of Health Sciences Simone Veil, Department of Family Medicine, 78180 Montigny le Bretonneux, France Université Paris-Saclay, Univ Paris-Sud, UVSQ, CESP, INSERM (U1018), Team 1: "Health services research," 94800 Villejuif, France. olivier.saint-lary@uvsq.fr.