1. Department of Gastroenterology; Suzuka General Hospital; Mie Japan
2. Department of Internal Medicine; Fujita Health University Nanakuri Sanatorium; Mie Japan
3. Department of Laboratory Medicine; Mie University School of Medicine; Mie Japan
4. Department of Medical Sciences; Toshiba General Hospital; Tokyo Japan
5. Division of Virology; Department of Infection and Immunity; Jichi Medical University School of Medicine; Tochigi Japan
6. Department of Gastroenterology; Toshiba General Hospital; Tokyo Japan