1. Ophthalmic Pathology Service; Asociación para Evitar la Ceguera en México; IAP, Hospital ‘Dr Luis Sánchez Bulnes’; Mexico City Mexico
2. Laboratory of Anatomopathology and Experimental Medicine; ‘Roberto Ruiz Obregón’; Mexico City Mexico
3. Pathology Service; Facultad de Medicina; UNAM y Hospital General de México ‘Dr Eduardo Liceaga’; Mexico City Mexico
4. Oculoplastics and Orbit Surgery Service; Asociación para Evitar la Ceguera en México; IAP, Hospital ‘Dr Luis Sánchez Bulnes’; Mexico City Mexico