1. Department of Internal Medicine and Radboud Center for Infectious Diseases, Radboud University Medical Center, Nijmegen, the Netherlands
2. University of Groningen, University Medical Center Groningen, Department of Genetics, the Netherlands
3. Division of Infectious Diseases, Duke University Medical Center, Durham, North Carolina
4. K.G. Jebsen Coeliac Disease Research Centre, Department of Immunology, University of Oslo, Norway
5. Human Genomics Laboratory, Craiova University of Medicine and Pharmacy, Craiova, Romania