1. Paediatric Ophthalmology and Strabismus Unit, Department of Surgery, San Paolo Hospital, University of Milano
2. G.B. Bietti Foundation for the Study and Research in Ophthalmology, IRCCS (Istituto di Ricovero e Cura a Carattere Scientifico), Roma - Italy
3. Storm Eye Institute, Department of Ophthalmology, Medical University of South Carolina, Charleston - USA