I Mohamad1, F W Abdul Manab2. 1. (Corresponding author) MD, M.Med (ORL-HNS) Department of ORL-HNS School of Medical Sciences, Universiti Sains Malaysia Health Campus, 16150 Kota Bharu, Kelantan, Malaysia. email: irfankb@usm.my. 2. MD, M.Med (ORL-HNS) Department of ORL-HNS School of Medical Sciences, Universiti Sains Malaysia Health Campus, Malaysia.