1. Department of Oral and Craniofacial Sciences, Faculty of Dentistry, Universiti Malaya, Kuala Lumpur 50603, Malaysia
2. Department of Oral Physiology, School of Dentistry, Matsumoto Dental University, 1780 Gobara Hirooka, Shiojiri, Nagano 399-0781, Japan
3. Department of Oral Biology and Biomedical Sciences, Faculty of Dentistry, MAHSA University, Jenjarom 42610, Malaysia
4. Department of Oral and Maxillofacial Clinical Sciences, Universiti Malaya, Kuala Lumpur 50603, Malaysia
5. Oral Cancer Research and Coordinating Center, Universiti Malaya, Kuala Lumpur 50603, Malaysia