1. Department of Otorhinolaryngology, Head & Neck Surgery, Faculty of Medicine, Universiti Kebangsaan Malaysia, Cheras, Kuala Lumpur, Malaysia
2. Department of Otorhinolaryngology, Head & Neck Surgery, Kulliyah of Medicine, International Islamic University Malaysia, Kuantan, Pahang, Malaysia
3. Oral & Maxillofacial Surgery Clinic, Universiti Kebangsaan Malaysia Hospital, 56000 Kuala Lumpur, Malaysia