1. Hospital Ramón y Cajal; Department of Ophthalmology; Carretera de Colmenar Viejo Km 9,100 Madrid Spain 28034
2. Universidad de Alcalá; Department of Surgery, School of Medicine; Madrid Spain
3. Laín Entralgo Agency (Cochrane Collaborating Centre); Health Technology Assessment Unit; Gran Vía 27, 7ª Planta Madrid Madrid Spain 28013