Text and Data Mining valid from 2018-11-28
Received: 16 June 2018
Revised: 10 September 2018
Accepted: 25 September 2018
First Online: 28 November 2018
Compliance with ethical standards
: The scientific guarantor of this publication is Young Han Lee.
: 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• Diagnostic or prognostic study• Performed at one institution