1. Department of Bacteriology, Osaka Dental University, Hirakata, Osaka, Japan
2. Genome-Lead Co., Ltd., Takamatsu, Kagawa, Japan
3. Graduate School of Dentistry (Geriatric Dentistry), Osaka Dental University, Hirakata, Osaka, Japan
4. Graduate School of Dentistry (Bacteriology), Osaka Dental University, Hirakata, Osaka, Japan
5. Department of Geriatric Dentistry, Osaka Dental University, Hirakata, Osaka, Japan