1 *Department of Ophthalmology and Visual Sciences, Federal University of SãoPaulo/Escola Paulista de Medicina (UNIFESP/EPM), São Paulo, Brazil †Cornea Service, Wills Eye Hospital, Philadelphia, PA ‡Department of Ophthalmology and Vision Science, University of Arizona, Tucson, AZ §Instituto de Olhos Renato Ambrósio, Rio de Janeiro, Brazil.