1. Department of Orthopedics, Kumamoto Orthopedic Hospital, Kumamoto 862-0976
2. Department of Microbiology, School of Pharmacy, Aichi Gakuin University, Nagoya 464-8650
3. Department of Microbiology, Gifu University Graduate School of Medicine, Gifu 501-1194
4. Chemo-Sero-Therapeutic Research Institute, Kumamoto 860-8568
5. Department of Microbiology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto 860-8556, Japan