Received: 27 June 2021
Accepted: 21 September 2021
First Online: 12 October 2021
: The study received central approval for all study sites from the Ethics Committee Comité de Protection des Personnes (CPP) Est-II in April 2014 under the number 14/427, and from the French Agency for the Safety of Medications and Health Products (Agence Nationale de Sécurité du Médicament et des produits de santé, ANSM) under the number 2013-A01802-43. Since included patients were in a coma at the time of inclusion, their legal representative was informed about the study, and provided written informed consent. Patients were informed of their inclusion in the study and their written consent was obtained as soon as they regained capacity.
: Not applicable.
: The authors declare that they have no competing interests.