1. Department of Ophthalmology, Hospital General Universitario Morales Meseguer, Murcia, Spain.
2. Department of Ophthalmology, Hospital Universitario de Jerez, Jerez de la Frontera Cadiz, Spain.
3. Department of Ophthalmology, Hospital Universitario Donostia, San Sebastian Guipuzcoa, Spain.
4. Instituto Oftalmológico Gomez-Ulla, Santiago de Compostela Galicia, Spain.
5. Department of Ophthalmology, Complejo Hospitalario Universitario de Albacete, Albacete, Spain.