1. Department of Clinical Laboratory, Toho University Medical Centre Omori Hospital, 6-11-1 Omori-nishi, Ota-ku, Tokyo 143-8541, Japan
2. Department of Microbiology and Infectious Disease, Toho University Graduate School of Medicine, 5-21-16 Omori-nishi, Ota-ku, Tokyo 143-8540, Japan
3. Department of Laboratory Medicine, Toho University Graduate School of Medicine, 5-21-6 Omori-nishi, Ota-ku, Tokyo 143-8540, Japan