1. Yong Loo Lin School of Medicine, National University of Singapore, Singapore 119228, Singapore
2. Department of Ophthalmology, National Healthcare Group Eye Institute, Tan Tock Seng Hospital, Singapore 308433, Singapore
3. Department of Ophthalmology, National Healthcare Group Eye Institute, Woodlands Health Campus, Singapore 768024, Singapore
4. Charles E. Schmidt College of Medicine, Florida Atlantic University, Boca Raton, FL 33431, USA
5. Department of Ophthalmology, Mayo Clinic, Jacksonville, FL 32224, USA