1. Pediatric Infectious Diseases Unit, 1st and 3rd Departments of Pediatrics, Faculty of Medicine, Aristotle University School of Health Sciences, Hippokration General Hospital of Thessaloniki, Thessaloniki, Greece
2. 3rd Department of Pediatrics, Faculty of Medicine, Aristotle University School of Health Sciences, Hippokration General Hospital of Thessaloniki, Thessaloniki, Greece
3. Department of Microbiology, Faculty of Health Sciences, School of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece
4. Department of Pediatrics, G. Genimatas General Hospital, Thessaloniki, Thessaloniki, Greece