Published on in Vol 8, No 12 (2020): December
                                    Preprints (earlier versions) of this paper are
                                    available at
                                    https://preprints.jmir.org/preprint/19061, first published
                                    .
                                

1 Barun ICT Research Center, Yonsei University, Seoul, Republic of Korea
2 Graduate School of Information, Yonsei University, Seoul, Republic of Korea
*all authors contributed equally
