Walsh, A. J., Brain, O., Keshav, S., Buchel, O. C., Merrin, B., Rolinski, M., Thomas, S., White, L., von Herbay, A., Warren, B. F., Altman, D. G., & Travis, S. (2009). Which Activity Index for Ulcerative Colitis (UC)? Evaluation of Inter-Observer Variation in Clinical, Endoscopic and Composite Indices. 136(5), A160–A160.

Walsh, A. J., et al. Which Activity Index for Ulcerative Colitis (UC)? Evaluation of Inter-Observer Variation in Clinical, Endoscopic and Composite Indices. no. 5, 2009, pp. A160–A160.

Walsh, AJ, O Brain, S Keshav, OC Buchel, B Merrin, M Rolinski, S Thomas, et al. 2009. “Which Activity Index for Ulcerative Colitis (UC)? Evaluation of Inter-Observer Variation in Clinical, Endoscopic and Composite Indices.” In , 136:A160–A160.