Guest Editors: Marcin Barczyński (Department of Endocrine Surgery, Third Chair of General Surgery, Jagiellonian University, Medical College, Kraków, Poland) and Maurizio Iacobone (Department of Surgery, Oncology and Gastroenterology, University of Padua, Italy)

Guest Editors: Jeremy D. Richmon (Department of Otolaryngology, Massachusetts Eye and Ear, Harvard Medical School, Boston, MA, USA) and Jonathon O Russell (Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins University, Baltimore, MD, USA)