Sabti, Saad; Tappeiner, Christoph; Früh Epstein, Beatrice (2015). Corneal Cross-Linking in a 4-Year-Old Child With Keratoconus and Down Syndrome. Cornea, 34(9), pp. 1157-1160. Lippincott Williams & Wilkins 10.1097/ICO.0000000000000491