Funding for this research was provided by:
National Research Foundation (NRF-2019R1A2C1007203)
Received: 10 August 2019
Accepted: 22 October 2019
First Online: 8 November 2019
Ethics approval and consent to participate
: This study was approved by the institutional review board of the Korean National Institute of Health for the KoGES and Hoseo University. Written informed consents were received from all of the subjects.
: Not applicable.
: The authors declare that they have no competing interests.