1. Department of Neuro-Ophthalmology, Asociación para Evitar la Ceguera en México, I.A.P. Mexico City, Mexico
2. Department of Pathology, Centro Médico Naval, Secretaria de Marina, Mexico City, Mexico
3. Department of Hematology, Centro Médico Naval, Secretaria de Marina, Mexico City, Mexico
4. Department of Ophthalmology, Centro Médico Naval, Secretaria de Marina, Mexico City, Mexico