VALIDATE-PERIANAL: an international real-world multi-centre exploratory validation of the TOpClass definition of a radiologically healed fistula in perianal fistulising Crohn's disease. - Anand, Easan; van Croonenburg, Thirza J.; Samaan, Sami; Tozer, Phil; Hart, Ailsa; Deepak, Parakkal; Ballard, David H.; Stoker, Jaap; Lung, Phillip (Insights into Imaging, 2026)