1. Department of Microbiology, School of Dentistry, Aichi Gakuin University, Nagoya, Aichi, Japan
2. Department of Chemistry, Umeå University, Umeå, Sweden
3. Department of Oral Immunology and Infectious Diseases, School of Dentistry, University of Louisville, Louisville, KY, USA
4. Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya, Aichi, Japan