1. Eye Unit, University Hospital Maggiore della Carita', Novara, Italy
2. Medical School, University East Piedmont “A. Avogadro”, Novara, Italy
3. Medical Physics, University Hospital Maggiore della Carità, Novara, Italy
4. University Eye Clinic San Giuseppe Hospital, Milan, Italy
5. Department of Clinical Science and Community Health, University of Milan, Milan, Italy
6. Department of Health Science, University East Piedmont “A. Avogadro”, Novara, Italy