[1] Univ Calgary, Fac Med, Dept Pharmacol & Therapeut, Mucosal Inflammat Res Grp, Calgary, AB T2N 4N1, Canada
[2] Univ Calgary, Fac Med, Dept Med, Calgary, AB T2N 4N1, Canada
[3] Univ Calif San Francisco, Dept Surg & Physiol, San Francisco, CA 94143 USA