1. Department of Internal Medicine, Syrian Private University, Damascus, Syrian Arab Republic; Department of Internal Medicine, University of Kentucky, Lexington, Kentucky, USA
2. Department of Internal Medicine, Damascus University, Damascus, Syrian Arab Republic
3. Department of Internal Medicine, University of Kentucky, Lexington, Kentucky, USA; Department of Internal Medicine, Damascus University, Damascus, Syrian Arab Republic
4. Department of Internal Medicine, Syrian Private University, Damascus, Syrian Arab Republic