1. First Department of Internal Medicine, Division of Infectious, Respiratory, and Digestive Medicine, University of the Ryukyus Graduate School of Medicine, Okinawa, Japan
2. Division of Clinical Laboratory and Blood Transfusion, University of the Ryukyus Hospital, Okinawa, Japan
3. Department of Dermatology, Advanced Medical Research Center, Graduate School of Medicine, University of the Ryukyus, Okinawa, Japan
4. Research Laboratory Center, Faculty of Medicine, University of the Ryukyus, Okinawa, Japan