Text and Data Mining valid from 2019-01-07
Received: 12 July 2018
Revised: 7 November 2018
Accepted: 4 December 2018
First Online: 7 January 2019
Compliance with ethical standards
: The scientific guarantor of this publication is Eun Young Chae.
: 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.
: Baek, Seung Hee, a statistician, kindly provided statistical advice for this manuscript.
: Written informed consent was waived by the Institutional Review Board.
: Institutional Review Board approval was obtained.
: Some study subjects or cohorts have been previously reported in Radiology 2018 Jun; 287(3): 771–777 by Ha et al.
: • retrospective• case-control study• performed at one institution