1. Department of Surgery, Unaizah College of Medicine and Medical Sciences, Qassim University, Buraydah, Kingdom of Saudi Arabia
2. Department of Otolaryngology-Head and Neck Surgery, Chosun University College of Medicine, Gwangju, Rep. of Korea
3. Department of Oral and Maxillofacial Surgery, School of Dentistry, Chosun University, Gwangju, Rep. of Korea