1. Infectious Diseases Unit, 3rd Department of Pediatrics, Faculty of Medicine, Aristotle University School of Health Sciences and Hippokration General Hospital, Thessaloniki, Greece
2. Infectious Diseases Unit, Pathophysiology Department, Medical School, National and Kapodistrian University of Athens, Athens, Greece
3. Departments of Medicine, Pediatrics, and Microbiology & Immunology, Weill Cornell Medicine of Cornell University and New York Presbyterian Hospital, New York, NY, USA