1. Department of Nuclear Medicine; University Hospital Münster, Albert-Schweitzer-Campus 1; Münster Germany
2. Institute of Biostatistics and Clinical Research; University Hospital Münster, Albert-Schweitzer-Campus 1; Münster Germany
3. Department of General; Visceral and Vascular Surgery; University Hospital, Medical Faculty, University of Halle-Wittenberg; Halle/Saale Germany