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Contributors All authors substantially contributed to the work and meet the authorship criteria as follows; conception and design, or analysis and interpretation of data: AT, YE, RS. Drafting the article or revising it critically for important intellectual content: MN. Final approval of the version to be published: MN, JT.
Competing interests None.
Patient consent Obtained.
Ethics approval The medical ethics committee at Osaka Rosai Hospital.
Provenance and peer review Not commissioned; internally peer reviewed.