1. Assistant Professor and Consultant of Conscious Sedation and Special Care Dentistry, Department of Basic and Clinical Oral Science, Faculty of Dentistry, Umm Al-Qura University, Makkah, Saudi Arabia
2. Assistant Professor of Oral Medicine, Department of Oral and Maxillofacial Surgery and Diagnostic Sciences, Faculty of Dentistry, Taif University, Saudi Arabia
3. Professor and Consultant of Endodontics, Department of Conservative Dentistry, Guy's and St Thomas' Foundation Trust, London
4. Assistant Professor and Consultant of Endodontics, Department of Restorative Dentistry, Faculty of Dentistry, Umm Al-Qura University, Makkah, Saudi Arabia