1 Division of Infectious Diseases, Department of Internal Medicine, American University of Beirut Medical Center, 1107 2020 Beirut, Lebanon.
2 Center for Pediatric Research in Obesity and Metabolism, UPMC Children's Hospital of Pittsburgh, University of Pittsburgh Medical Center, Pittsburgh, PA, USA.
3 Division of Infectious Diseases, Department of Internal Medicine, American University of Beirut Medical Center, 1107 2020 Beirut, Lebanon. Electronic address: nr00@aub.edu.lb.