[1] Univ Michigan, Dept Med, Div Gastroenterol & Hepatol, Ann Arbor, MI 48109 USA
[2] Penn State Univ, Div Gastroenterol & Hepatol, Dept Med, Milton S Hershey Med Ctr, Hershey, PA 17033 USA
[3] Penn State Univ, Dept Publ Hlth Sci, Milton S Hershey Med Ctr, Hershey, PA 17033 USA
[4] Penn State Univ, Ctr Liver, Milton S Hershey Med Ctr, Hershey, PA 17033 USA
[5] Penn State Univ, Inst Canc, Milton S Hershey Med Ctr, Hershey, PA 17033 USA