1. Centro de Cirugía Oftalmológica (CECOF), Caracas, Venezuela
2. Ophthalmology Department, Domingo Luciani Hospital, Avenue Francisco de Miranda, Torre Cavendes, Piso 6, Ofic. 6-04, Altamira, Caracas 1070, Venezuela
3. “Dr. Elías Santana” Hospital, Santo Domingo, Dominican Republic
4. Massachusetts Eye and Ear Infirmary, Boston, MA, USA