Text and Data Mining valid from 2019-09-16
Received: 27 June 2019
Revised: 6 August 2019
Accepted: 27 August 2019
First Online: 16 September 2019
Compliance with ethical standards
: The scientific guarantor of this publication is Afshin Gangi.
: 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 waived by the Institutional Review Board.
: Institutional Review Board approval was obtained.
: • retrospective• observational• performed at one institution