Published on in Vol 22 , No 7 (2020) :July
Preprints (earlier versions) of this paper are available at https://preprints.jmir.org/preprint/17996, first published .
1 Graduate School of Culture Technology, Korea Advanced Institute of Science and Technology, Daejeon, KR
2 Graduate School of Convergence Science and Technology, Seoul National University, Seoul, KR
3 Advanced Institute of Convergence Technology, Suwon, KR