Author Contributions
Shinya Koshinuma and Takafumi Fujii: Conception and design of the study, acquisition, analysis and/or interpretation of data, and drafting of the manuscript
Takeshi Okamura: acquisition of data
Yasuyuki Asada: analysis and/or interpretation of data
Yoshisato Machida: revising the manuscript critically for important intellectual content
Gaku Yamamoto: Conception and design of the study, revising the manuscript critically for important intellectual content
All authors critically revised the report, commented on drafts of the manuscript, and approved the final report.