[1] Keio Univ, Sch Med, Dept Internal Med, Shinjuku Ku, Tokyo 1608582, Japan
[2] Univ Penn, Med Ctr, Dept Pathol & Lab Med, Philadelphia, PA 19104 USA
[3] CSIC, Hosp Clin & Prov, IDIBAPS, Barcelona, Spain
[4] CUNY Mt Sinai Sch Med, Dept Biochem, New York, NY 10029 USA
[5] Univ Kentucky, GI Div, Lexington, KY USA