[1] Suny Downstate Med Ctr, Internal Med, New York, NY USA
[2] Univ Connecticut, Internal Med, East Hartford, CT USA
[3] George Washington Univ, Sch Publ Hlth, Washington, DC USA
[4] Rutgers New Jersey Med Sch, Newark, NJ USA
[5] Baylor Coll Med, Dept Med, Houston, TX USA
[6] Stanford Univ, Med Ctr, Div Gastroenterol & Hepatol, Stanford, CA USA
[7] Stanford Univ, Sch Med, Gastroenterol & Hepatol, Stanford, CA USA
[8] Baylor Coll Med, Gastroenterol & Hepatol, Houston, TX USA
[9] Baylor Coll Med, Dept Med, Sect Gastroenterol & Hepatol, Houston, TX USA