Received: 31 March 2019
Accepted: 23 October 2019
First Online: 6 November 2019
Ethics approval and consent to participate
: Ethical approval for the study was acquired from the Institutional Review Board on Human Subjects Research and Ethics Committees, Hanyang University (HYI-12-019). Enrollment of the respondents was voluntary, and all patients gave written consent to participate in the study.
: Not applicable.
: The authors declare that they have no competing interests.