1. Division of Infectious Diseases, American University of Beirut Medical Center, Beirut 110236, Lebanon
2. Biostatistics Unit, Clinical Research Institute, American University of Beirut, Beirut 110236, Lebanon
3. College of Medicine, Alfaisal University, Riyadh 11533, Saudi Arabia
4. Center for Infectious Diseases Research, American University of Beirut, Beirut 110236, Lebanon