Department of Gastroenterology and Hepatology, Mie University, 2-174 Edobashi, Tsu, Mie 514-8507, Japan Correspondence Hayato Nakagawa, Department of Gastroenterology and Hepatology, Mie University, 2-174 Edobashi, Tsu, Mie 514-8507, Japan. Email: [email protected]