1 First Department of Internal Medicine, Gastroenterology and Hepatology Section, AHEPA Hospital of the Aristotle University Medical School, Thessaloniki, Greece.
2 Department of Pathology, AHEPA Hospital of the Aristotle University Medical School, Thessaloniki, Greece.
3 Third Department of Internal Medicine, Papageorgiou Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece.
4 Department of Immunology and Histocompatibility, University of Thessaly, School of Health Sciences, Faculty of Medicine, Larissa, Greece.