[1] Univ Hosp Leicester NHS Trust, Ophthalmol Dept, Leicester, England
[2] Univ Brescia, ASST Spedali Civili Bescia, Med Sch, Eye Clin ,Dept Med & Surg Specialties,Radiol Sci &, Piazzale Spedali Civili 1, I-25125 Brescia, Italy
[3] Univ Roma Tor Vergata, Dept Expt Med, Ophthalmol Unit, Rome, Italy
[4] Harvard Med Sch, Schepens Eye Res Inst, Dept Ophthalmol, Massachusetts Eye & Ear, Boston, MA USA
[5] Univ Liverpool, Inst Life Course & Med Sci, Dept Eye & Vis Sci, Liverpool, England
[6] Royal Liverpool Univ Hosp, St Pauls Eye Unit, Dept Corneal Dis, Liverpool, England
[7] IRCCS Azienda Osped Univ Bologna, Ophthalmol Unit, Bologna, Italy
[8] San Bartolo Hosp, Dept Ophthalmol, Vicenza, Italy