1. Department of Ophthalmology, Duke Eye Center, Duke University School of Medicine, Durham, NC 27710, USA.
2. College of Optometry, The Ocular Surface Institute, University of Houston, Houston, TX 77204, USA.
3. Department of Neuroscience, Ophthalmology Unit, University of Padova, Padova 35128, Italy.
4. Department of Immunology, Duke University School of Medicine, Durham, NC 27710, USA.
5. Department of Dermatology, Duke University School of Medicine, Durham, NC 27710, USA.