1. Department of Gastroenterology, Katharinenhospital, Klinikum Stuttgart, Stuttgart, Germany
2. Deparment of Gastroenterology, Katharinenhospital, Klinikum Stuttgart, Stuttgart, Germany
3. Department of Surgery, Katharinenhospital, Klinikum Stuttgart, Stuttgart, Germany
4. Department of Surgery, Klinikum Stuttgart Katharinenhospital, Stuttgart, Germany
5. Department of Gastroenterology, Klinikum Stuttgart Katharinenhospital, Stuttgart, Germany