1. Department of Pediatrics, USC School of Medicine, Childrens Hospital of Los Angeles, Los Angeles, CA 90027.
2. Department of Microbiology, USC School of Medicine, Childrens Hospital of Los Angeles, Los Angeles, CA 90027.
3. Department of Ophthalmology, USC School of Medicine, Childrens Hospital of Los Angeles, Los Angeles, CA 90027.
4. Department of Pathology, School of Medicine, University of California at Davis, Davis, CA 95616.
5. Division of Ophthalmology, Childrens Hospital of Los Angeles, Los Angeles, CA 90027.