1. Fourth Department of Internal Medicine, Hippokration Hospital, School of Medicine, Thessaloniki, Greece
2. Department of Microbiology, Ahepa University Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
3. Department of Immunology, General Hospital G. Papanikolaou, Thessaloniki, Greece
4. Immunology Departments, National Peripheral Histocompatibility Center, Hippokration General Hospital of Thessaloniki, Thessaloniki, Greece