1. Department of Ophthalmology and Visual Sciences, School of Medical Sciences, Health Campus, USM, 16150 Kubang Kerian, Kelantan, Malaysia
2. Department of Psychiatry, School of Medical Sciences, Health Campus, USM, 16150 Kubang Kerian, Kelantan, Malaysia
3. Department of Ophthalmology, Universiti Kebangsaan Malaysia Medical Center, 56000 Kuala Lumpur, Wilayah Persekutuan, Malaysia
4. Department of Ophthalmology, Hospital Selayang, 68100 Batu Caves, Selangor, Malaysia