Centre for Immune Regulation and Department of Immunology, University of Oslo and Oslo University Hospital, Rikshospitalet, Oslo, Norway. Division of Clinical Immunology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary. Electronic address: papp.gabor@med.unideb.hu. Institute of Immunology, Oslo University Hospital, UllevÄl, Oslo, Norway. Division of Clinical Immunology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary. Department of Genetics, Cell- and Immunobiology & Department of Rheumatology, 3rd Department of Internal Medicine, Semmelweis University, Budapest, Hungary.