1 Department of Ophthalmology and Visual Science, School of Medical Sciences, Universiti Sains Malaysia; Hospital Universiti Sains Malaysia; Department of Ophthalmology, Kulliyyah of Medicine, International Islamic University Malaysia, Kuantan, Pahang, Malaysia.
2 Department of Ophthalmology and Visual Science, School of Medical Sciences, Universiti Sains Malaysia; Hospital Universiti Sains Malaysia, Kubang Kerian, Kelantan, Malaysia.
3 Department of Ophthalmology and Visual Science, School of Medical Sciences, Universiti Sains Malaysia; Hospital Universiti Sains Malaysia, Kubang Kerian, Kelantan, Malaysia; Salmaniya Medical Complex, Ministry of Health, Manama, Bahrain.