1. Department of Neurosurgery, Surgery Center, Ulm University Medical Center, D‑89081 Ulm, Germany
2. Department of Pediatrics and Adolescent Medicine, Ulm University Medical Center, D‑89081 Ulm, Germany
3. Department of General and Visceral Surgery, Surgery Center, Ulm University Medical Center, D‑89081 Ulm, Germany
4. Internal Medicine I, Ulm University Medical Center, D‑89081 Ulm, Germany
5. Faculty of Chemistry, Wroclaw University of Technology, 50‑370 Wroclaw, Poland