Text and Data Mining valid from 2018-01-30
Received: 23 November 2017
Revised: 4 December 2017
Accepted: 6 December 2017
First Online: 30 January 2018
Compliance with ethical standards
: The scientific guarantor of this publication is Dr Nicolas Amoretti MD
: 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.
: Dr Pauline Foti kindly provided statistical advice for this manuscriptThe author has significant statistical expertise.No complex statistical methods were necessary for this work.
: Written informed consent was obtained from all subjects (patients) in this study.
: Institutional Review Board approval was not required because of classical management of the procedure done every day.
: • retrospective• performed at one institution