Funding for this research was provided by:
the Korea Health Industry Development Institute (KHIDI) and the Ministry of Health and Welfare, Republic of Korea
Article History
Received: 21 June 2019
Accepted: 18 October 2019
First Online: 16 November 2019
Compliance with ethical standards
: The Kangbuk Samsung Hospital Institutional Review Board and Ethics Committee approved this study. The split-faced, prospective study protocol adhered to the guidelines in the 1975 Declaration of Helsinki.
: The authors declare that they have no conflict of interest.