Published on in Vol 8, No 11 (2020): November
                                    Preprints (earlier versions) of this paper are
                                    available at
                                    https://preprints.jmir.org/preprint/19679, first published
                                    .
                                

1 Sungkyunkwan University, Suwon, Republic of Korea
2 Korea Disabled People's Development Institute, Seoul, Republic of Korea
