1. Departments of Dermatology and Allergology; Hospital Dresden Friedrichstadt; Academic Teaching Hospital of the Technical University of Dresden; Dresden Germany
2. General and Visceral Surgery; Hospital Dresden-Neustadt; Academic Teaching Hospital of the Technical University of Dresden; Dresden Germany
3. Competence Centre for Adipositas and Metabolic Surgery; Hospital Dresden-Neustadt; Academic Teaching Hospital of the Technical University of Dresden; Dresden Germany
4. Department of Internal Medicine; Hospital Dresden-Neustadt; Academic Teaching Hospital of the Technical University of Dresden; Dresden Germany