1. Department of General, Visceral, and Vascular Surgery; Martin Luther University Halle-Wittenberg; Halle (Saale) Germany
2. Department of Otolaryngology; Division of Thyroid and Parathyroid Surgery; Massachusetts Eye and Ear Infirmary; Harvard Medical School; Boston Massachusetts
3. Department of Anesthesiology and Intensive Care Medicine; Martin Luther University Halle-Wittenberg; Halle (Saale) Germany