1. Clinic of Diagnostic and Interventional Radiology, Saarland University Medical Center, Homburg, Germany
2. Laboratoire de Physico-Chimie des Matériaux Luminescents, Université Claude Bernard, Lyon, France
3. Department of General, Visceral and Pediatric Surgery, Saarland University Medical Center, Homburg, Germany
4. Institute for Clinical and Experimental Surgery, Saarland University Medical Center, Homburg, Germany