1. Department of Clinical Pathophysiology, University of Florence, Florence, Italy
2. Department of General, Visceral and Vascular Surgery, University of Halle-Wittemberg, Halle/Saale, Germany
3. Department of Medicine, Division of General Internal Medicine, Radboud Adrenal Centre, University Nijmegen Medical Centre, Nijmegen, The Netherlands
4. Department of Medicine III, Carl Gustav Carus University Medical Centre, Dresden, Germany