1 Division of Hematology, Rheumatology and Respiratory Medicine, Department of Internal Medicine, Faculty of Medicine, Kagawa University, Kita-gun, Japan. Electronic address: tadokoro@med.kagawa-u.ac.jp.
2 Division of Hematology, Rheumatology and Respiratory Medicine, Department of Internal Medicine, Faculty of Medicine, Kagawa University, Kita-gun, Japan.
3 Division of Nephrology and Dialysis, Department of Cardiorenal and Cerebrovascular Medicine, Faculty of Medicine, Kagawa University, Japan.
4 Department of Pathology and Host Defense, Faculty of Medicine, Kagawa University, Japan.