Funding for this research was provided by:
Seoul Metropolitan Government Seoul National University (SMG-SNU) Boramae Medical Center
Article History
Received: 26 September 2019
Accepted: 26 February 2020
First Online: 13 March 2020
Competing interests
: Young Jun Chai, Jung-Man Lee, Yong Won Seong, and Hyeon Jong Moon have no conflicts of interest or financial ties to disclose.