Besides separate scientific projects, we systematically analyze collected data as for instance weight courses or blood values of our patients. In doing so, we assure not only quality management but also important scientific findings. For instance, this process is inevitable for our patients since we provide solid information on success rates but also complication rates of different surgical procedures. As a matter of course, we adhere to our »obligation »to »maintain »confidentiality. Therefore, collected data is exclusively processed and published anonymously, which means without a notification of patient names.