Received: 13 May 2019
Revised: 17 July 2019
Accepted: 7 August 2019
First Online: 26 August 2019
Compliance with ethical standards
: The scientific guarantor of this publication is Romain Gallet.
: The authors of this manuscript declare no relationships with any companies, whose products or services may be related to the subject matter of the article.
: No complex statistical methods were necessary for this paper.
: Written informed consent was not required for this study because this was a retrospective study.
: Institutional Review Board approval was obtained.
: • retrospective• case-control study• performed at one institution