[1] Univ Connecticut, Ctr Hlth, Dept Community Med, Farmington, CT USA
[2] Case Western Reserve Univ, Dept Pathol, Cleveland, OH 44106 USA
[3] Univ Sheffield, Royal Hallamshire Hosp, Sch Med, Gastroenterol & Liver Unit, Sheffield S10 2JF, S Yorkshire, England
[4] Univ Connecticut, Dept Mol & Cell Biol, Storrs, CT 06269 USA
[5] Univ Connecticut, Ctr Hlth, Ctr Mol Med, Colon Canc Prevent Program, Farmington, CT USA