1. Division of Neurology, Department of Internal Medicine, Faculty of Medicine, Damascus University, Damascus, Syria
2. Department of Otolaryngology, Faculty of Medicine, University of Aleppo, Aleppo, Syria
3. Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Damascus University, Damascus, Syria
4. Department of Dermatology, Faculty of Medicine, Tishreen University, Latakia, Syria
5. Faculty of Pharmacy, Damascus University, Damascus, Syria
6. Department of Orthodontics, Dental School, University of Damascus, Damascus, Syria
7. Faculty of Medicine, Albaath University, Homs, Syria
8. Evidence-based Practice Center, Mayo Clinic, Rochester, Minnesota, United States