1 ENT and Department of Head and Neck Surgery, Asklepios Klinik St. Georg, Hamburg, Germany ENT and Department of Head and Neck Surgery, Asklepios Klinik St. Georg, Hamburg, Germany ENT and Department of Head and Neck Surgery, Asklepios Klinik St. Georg, Hamburg, Germany ENT and Department of Head and Neck Surgery, Asklepios Klinik St. Georg, Hamburg, Germany Albers-Schönberg Institute for Radiology, Hamburg, Germany Asklepios Campus Hamburg of the Semmelweis University, Hamburg, Germany.