Correction to: Fundamental principles of an effective diabetic retinopathy screening program.

Paolo Lanzetta, Valentina Sarao, Peter H. Scanlon, Jane Barratt, Massimo Porta, Francesco Bandello, Anat Loewenstein, on behalf of the Vision Academy, Bora Eldem, Alex Hunyor, Antonia Joussen, Adrian Koh, Jean-François Korobelnik, Monica Lövestam-Adrian, Rafael Navarro, Annabelle A. Okada, Ian Pearce, Francisco J. Rodríguez, Giovanni Staurenghi, Sebastian Wolf