1. University Eye Clinic, IRCCS Policlinico San Matteo Foundation, Pavia - Italy
2. Eye Unit, Istituto Beato Palazzolo, Bergamo - Italy
3. Laboratory Epidemiologia e Statistica, IRCCS Policlinico San Matteo Foundation, Pavia - Italy
4. Eye Unit, AO Bolognini, Bergamo - Italy