1. The Ocular Surface Disease Clinic, The Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
2. Stein Eye Institute, David Geffen School of Medicine at UCLA, Los Angeles, California, USA
3. Bascom Palmer Eye Institute, University of Miami School of Medicine, Miami, Florida, USA
4. Department of Ophthalmology at New York University Grossman School of Medicine, New York University, New York, New York, USA
5. Illinois Eye and Ear Infirmary, University of Illinois, Chicago, Illinois, USA
6. Icahn School of Medicine at Mount Sinai, New York, New York, USA