1. Research Unit on Oral Microbiology and Immunology, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand.
2. Department of Microbiology, Faculty of Dentistry, Chulalongkorn University.
3. Research Unit of Mineralized Tissue, Faculty of Dentistry, Chulalongkorn University.
4. Department of Anatomy, Faculty of Dentistry, Chulalongkorn University.
5. Department of Preventive Dentistry, Faculty of Dentistry, Prince of Songkla University, Songkla, Thailand.