1. Department of Ophthalmology, National Healthcare Group Eye Institute, Tan Tock Seng Hospital, Singapore 308433, Singapore
2. Department of Ophthalmology, National Healthcare Group Eye Institute, Woodlands Health Campus, Singapore 737628, Singapore
3. Department of Surgery, Tan Tock Seng Hospital, National Healthcare Group, Singapore 308433, Singapore
4. Yong Loo Lin School of Medicine, National University of Singapore, Singapore 119077, Singapore
5. Department of Ophthalmology, Mayo Clinic, Jacksonville, FL 32224, USA