1. Department of Infectious Diseases, Osaka Prefectural Institute of Public Health, Osaka, Japan.
2. Sonezaki Furubayashi Clinic, Osaka, Japan.
3. Taiyuji-chou Taniguchi Clinic, Osaka, Japan.
4. Shirakaba Clinic, Tokyo, Japan.
5. National Hospital Organization, Nagoya Medical Center, Department of Clinical Laboratory, Nagoya, Japan.