1. Research Unit, Genetics Department, Institute of Ophthalmology, “Conde de Valenciana,” Mexico City, Mexico.
2. Departamento Clínico de Genética Médica, Hospital de Pediatría, Centro Médico Nacional Siglo XXI, IMSS, Mexico City, Mexico.
3. Institute of Ophthalmology, “Conde de Valenciana,” Mexico City, Mexico.
4. Department of Biochemistry, Faculty of Medicine, National Autonomous University of Mexico, Mexico City, Mexico.