Received: 14 July 2018
Accepted: 29 April 2019
First Online: 24 May 2019
Ethics approval and consent to participate
: All patients have signed an agreement allowing the record of their data in a database (NADIS) approved by a French data protection authority (Commission nationale de l’informatique et des libertés (CNIL) 770134) [CitationRef removed]. As a retrospective survey and in accordance with the European General Data Protection Regulation (n<sup>o</sup> 2016/679), this study has been locally registered in Dron Hospital. Furthermore, local ethical committee has approved this research (comité d’éthique du Centre Hospitalier Gustave Dron).
: Not applicable.
: The authors declare that they have no competing interests.
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