1. Institute for Clinical Ultrasound, Brandenburg Medical School Theodor Fontane, Neuruppin, Germany
2. Gastroenterology, Ruppiner Kliniken, Neuruppin, Germany
3. Private Practice, Practice for Internal Medicine and Cardiology, Oberkramer, Germany
4. Private Practice, Practice for Internal Medicine, Neuruppin, Germany
5. Private Practice, Practice for General Medicine, Rheinsberg, Germany
6. Faculty of Health Sciences Brandenburg, Brandenburg Medical School Theodor Fontane, Neuruppin, Germany