1 Department of Otolaryngology/Head and Neck Surgery, Klinikum Mutterhaus der Borromäerinnen Mitte, Faculty of Medicine Campus Trier, Johannes Gutenberg University of Mainz, Trier, Germany.
2 Department of Oral and Maxillofacial Surgery, UKGM GmbH, University Hospital of Giessen and Marburg, Campus Marburg, Faculty of Medicine, Philipps University, Marburg, Germany. Electronic address: poramate.pitakarnnop@gmail.com.