[1] Penn State Univ, Milton S Hershey Med Ctr, Dept Med, Sect Gastroenterol & Hepatol, Hershey, PA 17033 USA
[2] Penn State Univ, Milton S Hershey Med Ctr, Dept Pediat, Endocrinol Sect, Hershey, PA 17033 USA
[3] Penn State Univ, Milton S Hershey Med Ctr, Dept Pathol, Hershey, PA 17033 USA