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.