Funding for this research was provided by:
National Research Foundation of Korea (2020R1A4A1018598, NRF-2015M3A9E052338)
Received: 5 November 2020
Accepted: 19 April 2021
First Online: 29 April 2021
: Written informed consent was obtained from all study participants prior to the enrollment. This trial was approved by the Institutional Review Board at Kyung Hee University Korean Medicine Hospital and registered via Clinical Research information Service (CRiS) on 13 April 2018 (identifier: KCT0002796).
: Not applicable.
: The authors declare that they have no competing interests.