1. Division of Infectious Diseases, American University of Beirut Medical Center, P.O. Box 11-0236, Riad El Solh, Beirut 1107 2020, Lebanon
2. Department of Pathology & Laboratory Medicine, American University of Beirut Medical Center, Beirut 11072020, Lebanon
3. Division of Pulmonary and Intensive Care medicine, American University of Beirut Medical Center, Beirut 11072020, Lebanon
4. Division of Cardiology, American University of Beirut Medical Center, Beirut 11072020, Lebanon