1. Otolaryngology Department, Faculty of Medicine, Jordan University of Science and Technology, P.O Box 3030, Irbid 22110, Jordan
2. Otolaryngology Department, Faculty of Medicine, Hashemite University, P.O Box 3030127, Zarqa, Jordan
3. Department of Anesthesiology, Faculty of Medicine, Jordan University of Science and Technology, P.O Box 3030, Irbid 22110, Jordan