1 Department of Ophthalmology and Visual Sciences, University of Illinois at Chicago, Chicago, Illinois.
2 Department of Ophthalmology, USC Eye Institute, University of Southern California, Los Angeles, California.
3 Institute for Translational Genomics and Population Sciences, Los Angeles Biomedical Research Institute and Department of Pediatrics and Medicine at Harbor-UCLA, Torrance, California.
4 Department of Ophthalmology and Visual Sciences, University of Illinois at Chicago, Chicago, Illinois. Electronic address: rgao@uic.edu.