1. Division of Preventive Dentistry, WHO Collaborating Centre for Translation of Oral Health Science, Faculty of Dentistry, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
2. Faculty of Dentistry, Thammasat University, Pathum Thani, Thailand
3. Institute of Dentistry, Suranaree University of Technology, Nakhon Ratchasima, Thailand
4. Department of Dental Hygiene and Welfare, Meirin Junior College, Niigata, Japan