1. Department of Internal Medicine; Division of Gastroenterology; CGH Medical Center; Sterling Illinois USA
2. Section of Gastroenterology and Hepatology; Georgia Regents University; Augusta Georgia USA
3. Department of Internal Medicine, Division of Gastroenterology; Saint Francis Hospital; Evanston Illinois USA
4. Department of Internal Medicine; Division of Gastroenterology; University of Tishreen; Latakia Syria
5. Department of Mathematics and Computer Science; Georgia Regents University; Augusta Georgia USA