1 Department of Gastroenterology and Hepatology, Medical University of Silesia, Katowice, Poland. 2nd Department of Medicine, University Hospital Großhadern, Ludwig-Maximilians-Universität München, Munich, Germany. michal.zorniak@med.uni-muenchen.de
2 Department of Endocrinology and Neuroendocrine Tumors, Medical University of Silesia, Katowice, Poland
3 Department of Gastroenterology and Hepatology, Medical University of Silesia, Katowice, Poland
4 Department of Epidemiology, Medical University of Silesia, Katowice, Poland