1. Albert Eye Research Institute, Department of Ophthalmology, Duke Eye Center, Duke University School of Medicine, Durham, North Carolina, USA.
2. Department of Ophthalmology, University of Florida College of Medicine, Gainesville, Florida, USA.
3. Department of Molecular Genetics and Microbiology, University of Florida College of Medicine, Gainesville, Florida, USA.
4. Department of Pathology, Duke University School of Medicine, Durham, North Carolina, USA.