1. Department of Microbiology, Tokyo Medical University, Tokyo, Japan.
2. Department of Infection Control, Tokyo Medical University Hospital, Tokyo, Japan.
3. Department of Medical Treatment for Health Scientific Research, Bunkyo Gakuin University Graduate School, Tokyo, Japan.
4. Department of Microbiology Laboratory, Tokyo Medical University Hospital, Tokyo, Japan.
5. Department of Microbiology Laboratory, Miroku Medical Laboratory Co., Ltd., Nagano, Japan.