Text and Data Mining valid from 2019-10-21
Received: 17 May 2019
Accepted: 24 September 2019
First Online: 21 October 2019
Change Date: 26 November 2019
Change Type: Correction
Change Details: After publication of the original article , we were notified that an author’s name has been incorrectly spelled. Soon You Kwon’s correct full name is Soon Young Kwon.
Ethics approval and consent to participate
: The study protocol was approved by the institutional review board of Korea University Ansan Hospital (no. 2009AS0050). Written informed consent was obtained from each study participant.
: Not applicable.
: The authors declare that they have no competing interests.