1. Centro de Ojos Quilmes, Quilmes 1865, Argentina
2. Instituto Zaldivar, Ciudad de Buenos Aires 1865, Argentina
3. Department of Ophthalmology, Qvision, VITHAS Almería Hospital, 04120 Almeria, Spain
4. Department of Ophthalmology, Regional Universitary Hospital of Málaga, 18014 Granada, Spain
5. Department of Surgery, Ophthalmology Area, University of Seville, 41012 Seville, Spain
6. Department of Opthalmology, Vithas Malaga, 29016 Malaga, Spain