1. Department of Restorative Dental Sciences, College of Dentistry, Imam Abdulrahman bin Faisal University, Dammam, Saudi Arabia.
2. PhD Program in Biomedical Sciences, University of Maryland School of Dentistry, Baltimore, MD, USA.
3. Department of Biomedical and Applied Sciences, Indiana University School of Dentistry, Indianapolis, IN, USA.
4. Operative Dentistry Division, Department of General Dentistry, University of Maryland School of Dentistry, Baltimore, MD, USA.