1. Division of Microbiology and Infectious Diseases
2. Division of Cariology, Operative Dentistry and Endodontics, Department of Oral Health Science; Niigata University Graduate School of Medical and Dental Sciences; Chuo-ku Niigata
3. Faculty of Pharmaceutical Sciences; Tokushima Bunri University; Tokushima
4. Department of Pulp Biology and Endodontics; Division of Oral Health Sciences; Graduate School of Medical and Dental Sciences; Tokyo Medical and Dental University; Bunkyou-ku Tokyo Japan