1. Department of Paediatric Dentistry and Orthodontics, Faculty of Dentistry, Universiti Malaya, Kuala Lumpur 50603, Malaysia
2. College of Dentistry, Al-Iraqia University, Baghdad 10011, Iraq
3. Department of Conservative Dentistry, Faculty of Dentistry, University of Babylon, AL Hillah City 51002, Iraq
4. Department of Restorative Dentistry, Faculty of Dentistry, Universiti Malaya, Kuala Lumpur 50603, Malaysia
5. Department of Restorative Dentistry, College of Dentistry, Ajman University, Ajman P.O. Box 346, United Arab Emirates
6. Department of Chemistry, Faculty of Science, Universiti Malaya, Kuala Lumpur 50603, Malaysia
7. Department of Biomedical Engineering, Faculty of Engineering, Universiti Malaya, Kuala Lumpur 50603, Malaysia
8. Faculty of Dentistry, Oral & Craniofacial Sciences, King’s College London, London Bridge, London SE1 9RT, UK