1. Department of Cell Biology, Section Immunology; University of Groningen, University Medical Center Groningen; Groningen; The Netherlands
2. Institute of Medical Education; University Medical Center Groningen, University of Groningen; Groningen; The Netherlands
3. Mead Johnson Nutrition; Evansville; IN; USA
4. Department Laboratory Medicine, Laboratory of Liver, Digestive and Metabolic Diseases; University Medical Center Groningen, University of Groningen; Groningen; The Netherlands