Sungjin A Song1,2, Guri Sandhu3, Ramon A Franco1,2. 1. Department of Otolaryngology, Massachusetts Eye and Ear, Boston, Massachusetts, U.S.A. 2. Department of Otolaryngology, Harvard Medical School, Boston, Massachusetts, U.S.A. 3. National Centre for Airway Reconstruction, Charing Cross Hospital, Imperial College Healthcare NHS Trust, London, U.K.