1. Ophthalmology, Hospital Clínico San Carlos, Instituto de Investigación Sanitaria San Carlos (IdISSC), Madrid, Spain
2. Ramon Castroviejo Institute, Universidad Complutense, Madrid, Spain
3. Department of Epidemiology and Preventive Medicine, Hospital Clínico San Carlos, Universidad Complutense, Madrid, Spain
4. Department of Ophthalmology, Hospital Miguel Servet, Zaragoza, Spain