1. 4th Department of Internal Medicine; Medical School of Aristotle University; Hippokration General Hospital of Thessaloniki; Thessaloniki Greece
2. Department of Nuclear Medicine; Medical School of Aristotle University; Hippokration General Hospital of Thessaloniki; Thessaloniki Greece
3. Hygiene and Epidemiology; Medical School of Aristotle University; Hippokration General Hospital of Thessaloniki; Thessaloniki Greece