[1] Manchester Royal Eye Hosp, Oxford Rd, Manchester M13 9WL, Lancs, England
[2] Univ Roma Tor Vergata, Dept Clin Sci & Translat Med, I-00133 Rome, Italy
[3] Royal Liverpool Univ Hosp, Dept Corneal Dis, St Pauls Eye Unit, Liverpool L7 8XP, Merseyside, England
[4] Humanitas Univ, Dept Biomed Sci, I-20090 Pieve Emanuele, Italy
[5] Univ Brescia, Dept Med & Surg Specialties, Radiol Sci & Publ Hlth, Eye Clin, I-25121 Brescia, Italy
[6] ASST Civil Hosp Brescia, I-25123 Brescia, Italy
[7] Newcastle Univ, Biosci Inst, Catherine Cookson Bldg, Newcastle Upon Tyne NE2 4HH, Tyne & Wear, England
[8] Sunderland Eye Infirm, Queen Alexandra Rd, Sunderland SR2 9HP, England
[9] Humanitas Gavazzeni Castelli, Eye Ctr, I-24128 Bergamo, Italy