1. Department of General, Visceral, Vascular and Pediatric Surgery; University of Saarland; Homburg-Saar; Germany
2. Department of Gastroenterology, Hepatology, Endocrinology, Diabetology and Dietary Medicine; University of Saarland; Homburg-Saar; Germany
3. Department of Anesthesiology and Critical Care Medicine; University of Saarland; Homburg-Saar; Germany
4. Department of Dermatology, Venereology, and Allergology; University of Saarland; Homburg-Saar; Germany