Maria Fernanda Abalem1,2, P Kumar Rao3, Rajesh C Rao2,4. 1. Department of Ophthalmology, Faculty of Medicine, University of São Paulo, Brazil. 2. Department of Ophthalmology and Visual Sciences, W. K. Kellogg Eye Center, University of Michigan, Ann Arbor. 3. Department of Ophthalmology and Visual Sciences, Washington University School of Medicine, St Louis, Missouri. 4. Department of Pathology, University of Michigan, Ann Arbor.