1 Hospital Canselor Tuanku Muhriz, Universiti Kebangsaan Malaysia Medical Centre, Department of Otorhinolaryngology - Head & Neck Surgery, Kuala Lumpur, Malaysia; National University of Malaysia, Faculty of Medicine, Kuala Lumpur, Malaysia.
2 Hospital Canselor Tuanku Muhriz, Universiti Kebangsaan Malaysia Medical Centre, Department of Otorhinolaryngology - Head & Neck Surgery, Kuala Lumpur, Malaysia; National University of Malaysia, Faculty of Medicine, Kuala Lumpur, Malaysia. Electronic address: razif72@gmail.com.