Text and Data Mining valid from 2019-12-01
Received: 30 July 2019
Accepted: 17 December 2019
First Online: 23 December 2019
Ethics approval and consent to participate
: This study was conducted in accordance with the ethical guidelines for medical and health research involving human subjects. Written informed consent was obtained from all the participants when they visited the hospital, and the institutional review board of Ewha Womans University Mokdong Hospital approved this study (187–30).
: Not applicable.
: The authors declare that they have no competing interests.