1. Faculty of Health Sciences, Hokkaido University, Sapporo, Japan.
2. Clinical Research Center, National Hospital Organization Nagoya Medical Center, Nagoya, Japan.
3. Kitasato Otsuka Biomedical Assay Laboratories Co., Ltd., Kanagawa, Japan.
4. Mitsubishi Chemical Medience Corporation Central Laboratory, Tokyo, Japan.
5. Division of Laboratory and Transfusion Medicine, Hokkaido University Hospital, Sapporo, Japan.
6. National Institute of Infectious Diseases, Tokyo, Japan.
7. Department of Microbiology and Immunology, Keio University School of Medicine, Tokyo, Japan.