1. Department of Immunology, The Scripps Research Institute, 10550 North Torrey Pines Rd., La Jolla, CA 92037
2. Department of Clinical Laboratories, Omiya Medical Center, Jichi Medical School, Amanuma, Saitama 330-8503, Japan
3. Department of Biomedical Laboratory Sciences, School of Health Sciences, Shinshu University, Asahi, Matsumoto, Nagano 390-8621, Japan
4. Department of Laboratory Medicine, Shinshu University School of Medicine, Asahi, Matsumoto, Nagano 390-8621, Japan