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Article History

Received: 21 September 2018

Accepted: 25 October 2018

First Online: 24 November 2018

Ethics approval and consent to participate

: All participants were required to give written informed consent prior to study participation, and participant information was not provided to interviewers before the interview. The current study was carried out in accordance with the Declaration of Helsinki. The protocol was approved by the Institutional Review Board of Jaseng Hospital of Korean Medicine in Seoul, Korea (JASENG 2016–12-006).

: Not applicable.

: The authors declare that they have no competing interests.

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