1. Department of Preventive Dental Sciences, Prince Sattam Bin Abdul Aziz University, Alkharj, Kingdom of Saudi Arabia
2. Department of Dental Services, King Khalid Hospital and Prince Sultan Centre for Health Care, Al-Kharj, Riyadh, Kingdom of Saudi Arabia
3. Department of Dental Services, Prince Salman Bin Mohamad Hospital, Al-Dilam, Riyadh, Kingdom of Saudi Arabia
4. Department of Dental Services, Western Riyadh Dental Complex, Riyadh, Kingdom of Saudi Arabia