Sensitive markers of renal dysfunction are elevated in chronic ulcerative colitis (CUC): Asacol® Study Group: C. Sninsky, S. Hanauer, B. Powers, M. Robinson, J. Mayle, C. Elson, M. DeMicco, J. Butt, R. Pruitt, J. McHattie, J. Bozdech, M. Safdi, M. Gurney, A. Fixelle, D. Wolf, A. Levin, J. Smoots (with sites located in FL, IL, CO, OK, MI, AL, CA, MO, TN, Canada, OH, OR, GA, WA)