1 Department of Otorhinolaryngology - Head & Neck Surgery, Universiti Sains Malaysia, School of Medical Sciences, 16150 Kubang Kerian, Kelantan, Malaysia
2 Department of Otorhinolaryngology - Head & Neck Surgery, Universiti Sains Malaysia, School of Medical Sciences, 16150 Kubang Kerian, Kelantan, Malaysia. Electronic address: baharudin@usm.my