1 Department of Otorhinolaryngology, Head and Neck Surgery, Hospital Selayang, Batu Caves, Selangor, Malaysia.
2 Department of Otorhinolaryngology, Head and Neck Surgery, Hospital Universiti Kebangsaan Malaysia, Cheras, Kuala Lumpur, Malaysia.
3 Department of Otorhinolaryngology, Head and Neck Surgery, Hospital Universiti Kebangsaan Malaysia, Cheras, Kuala Lumpur, Malaysia anna_firra82@yahoo.com.au.
4 Department of Oral Surgery, Hospital Selayang, Batu Caves, Selangor, Malaysia.