1. Department of Preventive Dental Sciences, College of Dentistry, King Saud Bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia
2. King Abdullah International Medical Research Center, Ministry of National Guard Health Affairs, Riyadh, Saudi Arabia
3. Department of Public Health Dentistry, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technichal Sciences, Saveetha University, Chennai, Tamil Nadu, India