1. Department of Immunology, Graduate School of Medicine, University of the Ryukyus, Okinawa, Japan.
2. Department of Immunotherapeutics, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan.
3. Department of Pathology, Emory University School of Medicine, Atlanta, Georgia.
4. Department of Microbiology, Kawasaki Medical School, Okayama, Japan.