1. First Department of Intensive Care, Evangelismos Hospital, Medical School, National and Kapodistrian University of Athens, 10676 Athens, Greece
2. Department of Infectious Diseases, Laiko General Hospital, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece
3. Laboratory of Clinical Virology, School of Medicine, University of Crete, 71003 Heraklion, Greece