Funding for this research was provided by:
the Ministry of Science and ICT of the Republic of Korea (NRF-2017R1C1B5015871)
Received: 7 September 2019
Accepted: 29 November 2019
First Online: 9 December 2019
Ethics approval and consent to participate
: This study was conducted with the approval of our institution’s institutional review board (Haeundae Paik Hospital, Busan, Korea).
: Not applicable.