1. Department of Diagnostic Imaging, National University Health System, Singapore 119074.
2. National Healthcare Group Eye Institute, Tan Tock Seng Hospital, Level 1, TTSH Medical Centre, Singapore 308433.
3. Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117597.
4. Dr. Goh Eye Neuro-Ophthalmic and Low Vision Specialist, Mount Elizabeth Novena Specialist Centre, Singapore 329563.
5. Department of Neuroradiology, National Neuroscience Institute, Singapore 308433.