A. Guha, K. Chaurasia, H. D. Singh, M. Joshi, and B. B. Pal, “Relapsing severe Crohn’s colitis and perianal fistula on Infliximab maintenance therapy”, Eastern J Med Sci, vol. 4, no. 4, pp. 169–172, Nov. 2019, doi: 10.32677/EJMS.2019.v04.i04.006.