Published on in Vol 9, No 5 (2021): May
                                    Preprints (earlier versions) of this paper are
                                    available at
                                    https://preprints.jmir.org/preprint/24803, first published
                                    .
                                

1 Department of Pulmonary and Critical Care Medicine, Asan Medical Center, Seoul, Republic of Korea
2 Yonsei University, Seoul, Republic of Korea
3 Department of Oncology, Asan Medical Center, Seoul, Republic of Korea
*these authors contributed equally
