1. Division of Endocrinology, Diabetes and Metabolism, Hematology and Rheumatology (Second Department of Internal Medicine), Graduate School of Medicine, University of the Ryukyus, Nishihara, Japan
2. Department of Radiology, Graduate School of Medical Science, University of the Ryukyus, Nishihara, Japan
3. Internal Medicine, Heart-Life Hospital, Nakagusuku, Japan
4. Department of Pathology and Cell Biology, Graduate School of Medicine, University of the Ryukyus, Nishihara, Japan
5. Laboratory of Immunohematology, School of Health Sciences, Faculty of Medicine, University of the Ryukyus, Nishihara, Japan