1. Tissue Engineering and Cell Therapy Group, Singapore Eye Research Institute, Singapore, Singapore.
2. Department of Ophthalmology, National Taiwan University Hospital, Taipei, Taiwan.
3. Advanced Ocular Surface and Corneal Nerve Research Center, National Taiwan University, Taipei, Taiwan.
4. Department of Ophthalmology, College of Medicine, National Taiwan University, Taipei, Taiwan.
5. Corneal and External Eye Disease Department, Singapore National Eye Centre, Singapore, Singapore.
6. Ophthalmology and Visual Sciences Academic Clinical Program, Duke-NUS Medical School, Singapore, Singapore.
7. Department of Ophthalmology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.