Regunath Kandasamy1, Sim Sze Kiat1, Nik Ruzman2. 1. Centre for Neuroscience Services and Research, Universiti Sains Malaysia Health Campus, 16150 Kubang Kerian, Kelantan, Malaysia. 2. Department of Nucleur Medicine, Radiotherapy and Oncology, School of Medical Sciences, Universiti Sains Malaysia Health Campus, 16150 Kubang Kerian, Kelantan, Malaysia.