1. Ōmura Satoshi Memorial Institute, Kitasato University, Tokyo, Japan
2. Department of Bacteriology, Graduate School of Medicine Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan
3. School of Veterinary Medicine, Azabu University, Sagamihara, Kanagawa, Japan
4. Kochi University, Kochi, Japan
5. Kotobiken Medical Laboratories, Inc., Tsukuba, Ibaraki, Japan