Author contributions
All authors were involved in the preparation of this manuscript. NS:
examined patients, collected the data, original draft preparation, TH:
examined patients, collected the data, reviewing, and editing, SN,
YHazama, SY, YHachisu, YT, TY, NK, and YHosouchi: examined patients and
collected the data, KK: pathological analyses, HT: reviewing, and
editing, SK: reviewing, and editing, TU supervision. All authors read
and approved the final version of the manuscript.