1. Department of Infectious Diseases and Pediatric Immunology; Faculty of Medicine; University of Debrecen; Debrecen Hungary
2. Department of Public Health; School of Medicine; V. Babeş University of Medicine & Pharmacy Timişoara; Timişoara, Romania
3. Division of Clinical Immunology; Institute of Internal Medicine; Faculty of Medicine; University of Debrecen; Debrecen; Hungary