1. College of Medicine, Taif University, Taif, Saudi Arabia
2. Department of Otolaryngology—Head and Neck Surgery, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia
3. Department of Otolaryngology—Head and Neck Surgery at College of Medicine, Alfaisal University, Riyadh, Saudi Arabia
4. Clinical fellowship in Rhinology and Paranasal Sinus Surgery at the University of Iowa Hospital and Clinics, Iowa City, IA, USA
5. Clinical fellowship in Rhinology and Endoscopic Skull Base Surgery at the University of Miami Miller School of Medicine, Miami, FL, USA