1. Department of Internal Medicine, Division of Infectious Diseases, American University of Beirut Medical Center, Beirut, Lebanon
2. School of Medicine, Universidad Libre, Cali, Colombia
3. School of Medicine, Universidad Tecnológica de Pereira
4. Unidad de Investigación, Hospital Infantil de México, Federico Gómez, México City, México
5. Department of Medicine, Division of Infectious Diseases, University of Colorado Hospital, Colorado, USA