| Affiliation: | (1) Health Services Research and Development, Center for Health Services Research in Primary Care, Durham Veterans Affairs Medical Center, 508 Fulton Street (152), Durham, NC 27705, USA;(2) Division of Gastroenterology, Department of Medicine, Duke University Medical Center, Durham, NC, USA;(3) Department of Biostatistics and Bioinformatics, Duke University Medical Center, Durham, NC, USA;(4) Division of Gastroenterology and Hepatology, University of North Carolina, CB# 7555, 4157 Bioinformatics Building, Chapel Hill, NC 27599-7555, USA;(5) Professor Emeritus, Department of Population Medicine, Harvard Medical School, 208 Boulder Bluff, Chapel Hill, NC 27516, USA;(6) Department of Medicine, Section of Gastroenterology and Hepatology, Michael E DeBakey VA Medical Center & Baylor College of Medicine, Houston, TX, USA |
