Text and Data Mining valid from 2018-09-18
Received: 11 July 2018
Revised: 3 August 2018
Accepted: 16 August 2018
First Online: 18 September 2018
Compliance with ethical standards
: The scientific guarantor of this publication is Dr. Myeong-Jin Kim, Severance Hospital.
: 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.
: Yunho Rho, Yonsei University, College of Medicine, kindly provided statistical advice for this manuscript.
: 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