1. Department of Ophthalmology and Visual Sciences, University of Illinois at Chicago, Chicago, IL 60612, USA.
2. Department of Microbiology and Immunology, University of Illinois at Chicago, Chicago, IL 60612, USA.
3. Department of Dermatology, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA.
4. College of Medicine, Lake Erie College of Osteopathic Medicine, Erie, PA 16509, USA.