Details of ethics approval
Our study complies with French law. The Institutional Review Board (Comité de Protection des Personnes Ouest III) approved the protocol on 9 February 2017 (IDRBC 2017-A000308-45), and the study was registered by the national data protection authority (Commission Nationale Informatique et Libertes, CNIL) on 16 August 2017 (DR-2017-245).