Masaaki Yamada1,2, Kazuki Yamada2, Haruka Fujinami3. 1. Department of Epidemiology and Health Policy, University of Toyama, Toyama, Japan. 2. Department of Internal Medicine, Yatsuo General Hospital, Toyama, Japan. 3. Department of Gastroenterology and Hematology, University of Toyama, Toyama, Japan.