A comparative randomized trial of intubation success in difficult intubation cases: the use of a Frova intubation catheter versus a Bonfils intubation fiberoscope - Ozkan Onal; Irem Gumus; Aysun Ozdemirkan; Faruk Cicekci; Mehmet Sarı; Hasan Bayram; Cansu Ciftci; Emine Aslanlar; Jale Celik (Videosurgery and Other Miniinvasive Techniques)