Masaya Iwamuro, MD, PhD ⁎ 
Department of Gastroenterology and Hepatology, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Kagawa, Kan'onji, Japan
∗Corresponding author: Dr Masaya Iwamuro, Department of Gastroenterology and Hepatology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8558, Japan.Department of Gastroenterology and HepatologyOkayama University Graduate School of MedicineDentistry and Pharmaceutical SciencesOkayama700-8558Japan
Takehiro Tanaka, MD, PhD
Department of Pathology, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Kagawa, Kan'onji, Japan
Seiji Kawano, MD, PhD
Department of Gastroenterology and Hepatology, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Kagawa, Kan'onji, Japan
Nobumasa Ikeda, MD, PhD
Clinic Ikeda, Kagawa, Kan'onji, Japan
Motoyuki Otsuka, MD, PhD
Department of Gastroenterology and Hepatology, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama, Japan