Funding for this research was provided by:
KAIST funded Global Singularity Research Program for 2019
Received: 5 December 2020
Accepted: 24 March 2021
First Online: 7 April 2021
: This study was approved by Institutional Review Board of the Korea Advanced Institute of Science and Technology (KH2019-05). All subjects gave written informed consent prior to data collection.
: Participants gave written informed consent to data treatment in this research study and permission to publish anonymous data and results.
: The authors declare that they have no competing interests.