1. College of Medicine, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia
2. Department of Medicine, Emory University School of Medicine, Atlanta, Georgia, USA
3. Division of Infectious Diseases, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia, USA
4. Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, Georgia, USA