1)Wollensak G, Spoerl E, Seiler T:Riboflavin/ ultraviolet-a-induced collagen crosslinking forthe treatment of keratoconus. Am J Ophthalmol 135:620-627,2003.
2)Brummer G, Littlechild S, McCall S, et al:The role of nonenzymatic glycation and carbonyls in collagen cross-1inking for the treatment of keratoconus. Invest Ophthalmol Vis Sci 52:6363-6369,2011.
3)Wittig-Silva C, Whiting M, Lamoureux E, et al:Arandomized controlled trial of corneal collagen cross-linking in progressive keratoconus:prelimi-nary results. J Refract Surg 24:S720-725,2008.
4)Coskunseven E, Jankov MR 2nd, Hafezi F: Contralateral eye study of corneal collagen cross-linking with riboflavin and UVA irradiation in pa-tients with keratoconus. J Refract Surg 25:371- 376,2009.
5)Koller T, Mrochen M, Seiler T:Complication and failure rates after corneal crosslinking. J Cataract Refract Surg 35:1358-1362,2009.