1 University of Pittsburgh School of Medicine, Pittsburgh, PA, USA.
2 Ophthalmology department and faculty of medicine, Joan XXIII University Hospital, Rovira i Virgili UniversityTarragona, Spain. Electronic address: [email protected].
3 Royal Free Hospital NHS Foundation Trust, London, UK.
4 Asociados de Macula, Vitreo y Retina de Costa Rica, Primer Piso Torre Mercedes, Paseo Colón, San José, Costa Rica.