1. Department of Otolaryngology–Head and Neck Surgery McGill University Montreal Canada
2. Department of Otolaryngology–Head and Neck Surgery King Abdulaziz University Jeddah Saudi Arabia
3. Department of Oral Health Policy and Epidemiology Harvard School of Dental Medicine Boston Massachusetts USA
4. Department of Dental Public Health, Faculty of Dentistry King Abdulaziz University Jeddah Saudi Arabia