1. Clinical Study and Training Center, Saiseikai Chuwa Hospital, Sakurai, Nara 633‑0054, Japan
2. Department of Gastroenterology, Saiseikai Chuwa Hospital, Sakurai, Nara 633‑0054, Japan
3. Department of Pathology, Saiseikai Chuwa Hospital, Sakurai, Nara 633‑0054, Japan