Authors’ contributions
TD
SM, TD, TSuzuki, YN, TK, MT, TSuichi, and SKuwabara contributed to the conception or design of this study, and to the acquisition, analysis, and interpretation of data; they also drafted this manuscript. SKodama and KS contributed to the conception or design of the study. Finally, all named authors have made substantial contributions, meet the International Committee of Medical Journal Editors criteria for authorship of this article, and take responsibility for the integrity of this work as a whole. All authors have reviewed and approved the final manuscript.