[1] Rochester Gen Hosp, Internal Med, New York, NY USA
[2] Univ West Virginia, Internal Med, Morgantown, WV USA
[3] Univ Alabama, Gastroenterol & Hepatol, Tuscaloosa, AL 35487 USA
[4] Univ Texas Galveston, Galveston, TX USA
[5] Univ Alabama Birmingham, Div Gastroenterol & Hepatol, Birmingham, AL USA