1. Division of Neurosurgical Research, Heidelberg University, Mannheim, Germany; European Center of Angioscience, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
2. Department of Pathology and Medical Biology, University Medical Center Groningen, Groningen, The Netherlands
3. Department of Gastroenterology and Hepatology, University Medical Center Groningen, Groningen, The Netherlands