1. Department of Preventive Dental Sciences, College of Dentistry, Prince Sattam Bin Abdulaziz University, Al-Kharj, Saudi Arabia
2. Saudi Board of Endodontics, Riyadh, Saudi Arabia
3. Ministry of Health, Riyadh, Saudi Arabia
4. Division of Endodontics, Department of Restorative Dental Sciences, College of Dentistry, King Saud University, Riyadh, Saudi Arabia
5. Department of Public Health, Interuniversity Institute for Biostatistics and Statistical Bioinformatics, KU Leuven and Universiteit Hasselt, Belgium
6. Department of Oral Health Sciences, KU Leuven Dentistry, University Hospitals Leuven, Belgium