1. Department of Immunology, Allergology, and Rheumatology Faculty of Medicine and Health Sciences; University of Antwerp; Antwerp University Hospital; Antwerpen Belgium
2. Department of Pediatrics; Faculty of Medicine and Health Sciences; University of Antwerp; Antwerp University Hospital; Antwerpen Belgium
3. Institute for Prevention and Occupational Medicine; German Social Accident Insurance; Ruhr-University Bochum; Bochum Germany