1. Department of Family Medicine; University of North Carolina School of Medicine; Chapel Hill NC USA
2. State Key Laboratory of Quality Research in Chinese Medicine; Macau University of Science and Technology; Taipa Macau
3. Laboratory of Clinical Investigation; Division of Intramural Research Programs; National Institute on Aging; National Institutes of Health; Baltimore MD USA
4. Division of Pharmacotherapy and Experimental Therapeutics; University of North Carolina Eshelman School of Pharmacy; Chapel Hill NC USA
5. Division of Gastroenterology and Hepatology; University of North Carolina School of Medicine; Chapel Hill NC USA