[1] Univ Pittsburgh, Div Gastroenterol Hepatol & Nutr, Dept Med, Sch Med Ctr, Pittsburgh, PA 15213 USA
[2] Univ Pittsburgh, Dept Surg, Div Surg Oncol, Sch Med, Pittsburgh, PA 15213 USA
[3] Univ Pittsburgh, Med Ctr, Childrens Hosp Pittsburgh, Dept Pediat,Div Pediat Gastroenterol Hepatol & Nu, Pittsburgh, PA 15213 USA
[4] Univ Maryland, Dept Med, Div Gastroenterol & Hepatol, Baltimore, MD 21201 USA
[5] Penn State Milton S Hershey Med Ctr, Dept Med, Div Gastroenterol & Hepatol, Hershey, PA USA
[6] Univ N Carolina, Sch Med, Dept Med, Div Gastroenterol & Hepatol, Chapel Hill, NC USA
[7] Dartmouth Hitchcock Med Ctr, Sect Gastroenterol & Hepatol, Dept Med, Lebanon, NH 03766 USA
[8] Yale Univ, Sch Med, Dept Internal Med, Sect Digest Dis, New Haven, CT 06510 USA
[9] Gastroenterol Consultants Connecticut, New Haven, CT USA
[10] Univ Pittsburgh, Dept Pathol, Div Anat Pathol, Sch Med, Pittsburgh, PA 15213 USA
[11] Univ Pittsburgh, Dept Radiol, Sch Med, Pittsburgh, PA 15213 USA
[12] Univ Pittsburgh, Dept Psychiat, Sch Med, Pittsburgh, PA 15213 USA
[13] Univ Pittsburgh, Dept Pediat, Sch Med, Pittsburgh, PA 15213 USA
[14] Univ Pittsburgh, Dept Med, Sch Med, Pittsburgh, PA 15213 USA
[15] Univ Pittsburgh, Dept Surg, Div Colon & Rectal Surg, Sch Med, Pittsburgh, PA 15213 USA