1 Department of Internal Medicine, University Hospitals Leuven, Leuven, Belgium.
2 KU Leuven Department of Microbiology, Immunology and Transplantation, Allergy and Clinical Immunology Research Group, Leuven, Belgium; Department of General Internal Medicine, University Hospitals Leuven, Leuven, Belgium.
3 KU Leuven Department of Microbiology, Immunology and Transplantation, Allergy and Clinical Immunology Research Group, Leuven, Belgium; Department of General Internal Medicine, University Hospitals Leuven, Leuven, Belgium. Electronic address: rik.schrijvers@uzleuven.be.