1. Doheny Image Analysis Laboratory, Doheny Eye Institute, Pasadena, CA 91103, USA
2. School of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA
3. Electrical and Computer Engineering, University of California, Los Angeles, CA 90095, USA
4. Department of Ophthalmology, David Geffen School of Medicine, University of California, Los Angeles, CA 90095, USA