1. Endocrine Unit, Penang Hospital, Georgetown, Malaysia.
2. Department of Ophthalmology, Penang Hospital, Georgetown, Malaysia.
3. Department of Medicine, Penang Medical College, Georgetown, Malaysia.
4. Department of Ophthalmology, Selayang Hospital, Kuala Lumpur, Malaysia.
5. Department of Medicine, University Sains Malaysia, Kubang Kerian, Malaysia.