Published on in Vol 8, No 8 (2020): August
                                    Preprints (earlier versions) of this paper are
                                    available at
                                    https://preprints.jmir.org/preprint/21056, first published
                                    .
                                

1 Department of Diagnostic and Generalist Medicine, Dokkyo Medical University, Mibu, Japan
2 Department of General Internal Medicine, Nagano Chuo Hospital, Nagano, Japan
