1 Division of Cardiology and Clinical Immunology, Yamaguchi University Graduate School of Medicine, Department of Medicine and Clinical Science, Ube, Japan.
2 Division of Cardiology and Clinical Immunology, Yamaguchi University Graduate School of Medicine, Department of Medicine and Clinical Science, Ube, Japan. Electronic address: mkubo@yamaguchi-u.ac.jp.
3 Department of Pathology, Yamaguchi University Graduate School of Medicine, Ube, Japan.
4 Department of Gastroenterology and Hepatology, Yamaguchi University Graduate School of Medicine, Ube, Japan.