1. Digestive center for diagnosis and treatment; Damascus Syrian Arab Republic
2. Department of Gastroenterology; All India Institute of Medical Sciences; New Delhi India
3. Division of Gastroenterology and Hepatology; Mayo Clinic; Rochester MN USA
4. Robert D and Patricia E Kern Center for the Science of Health Care Delivery; Mayo Clinic; Rochester MN USA
5. Library Public Services; Mayo Clinic; Rochester MN USA