Funding for this research was provided by:
Korea University (K1625491, K1722121, and K1811051)
National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (2018R1C1B6002794)
Received: 24 March 2019
Accepted: 27 December 2019
First Online: 2 January 2020
Ethics approval and consent to participate
: Not applicable
: Not applicable (no identifying patient data).
: The authors have no financial or proprietary interest in any product, method, or material described herein.