1. Department of Gastroenterology and Hepatology, University of Groningen, University Medical Center Groningen, Groningen, Netherlands
2. Department Medical Microbiology, University of Groningen, University Medical Center Groningen, Groningen, Netherlands
3. Grupo Gastrohepatología, Facultad de Medicina, Universidad de Antioquia, Medellin, Colombia
4. Department of Laboratory Medicine, University of Groningen, University Medical Center Groningen, Groningen, Netherlands