机构:
Vet Affairs Boston Healthcare Syst, Dept Med, Div Gastroenterol, West Roxbury, MA USA
Harvard Med Sch, Beth Israel Deaconess Med Ctr, Dept Med, Div Gastroenterol Hepatol & Endoscopy, Boston, MA USAVet Affairs Boston Healthcare Syst, Dept Med, Div Gastroenterol, West Roxbury, MA USA