Received: 31 May 2019
Accepted: 11 August 2019
First Online: 22 August 2019
: No conflict of interest to declare
: This study was conducted according the French rules (Bioethics law of November 2016 – research category number 3), and the Comité National Informatique et Liberté (French Data Protection Authority) recommendations for the anonymous extraction and treatment of data. According to these rules, due to the study retrospective nature, it was not necessary to obtain the patients’ informed consent for the analysis of their personal data. The study protocol conforms to the ethical guidelines of the 1975 Declaration of Helsinki (6th version, 2008).
: Not applicable