Successful Big Bubble-Assisted Deep Anterior Lamellar Keratoplasty in a Patient with Intracorneal Ring Segments and Previous Corneal Collagen Cross-Linking for Keratoconus - della Volpe Waizel, Maria; Elalfy, Mohamed; Thabit, Ahmed; Hamada, Samer; Pruente, Christian; Scholl, Hendrik P. N.; Gatzioufas, Zisis (Klinische Monatsblätter für Augenheilkunde, 2019)