Goddard GR, Lim IIP, Cheng YC, Velazco CS, Jenkins T, Rosen NG, Kotagal M, Garrison AP, Falcone R, Rymeski B, Frischer JS. A child presents with perianal symptoms - how often is this Crohn's disease? J Pediatr Surg. 2021 Sep; 56(9):1618-1622.