1 Clinic of Gastroenterology, City Hospital Magdeburg GmbH, 39130 Magdeburg, Germany.
2 Institute of Molecular and Clinical Immunology, Otto-von-Guericke-University Magdeburg, Magdeburg, Germany.
3 Department of Nutritional Sciences, School of Life Course and Population Sciences, Faculty of Life Sciences and Medicine, King's College London, London, UK. Electronic address: wolfgang.maret@kcl.ac.uk.