1. Burisch J, Kiudelis G, Kupcinskas L, et al. Natural disease course of Crohn’s disease during the first 5 years after diagnosis in a European population-based inception cohort: an Epi-IBD study. Gut 2019;68:423-433.
3. Shah SC, Colombel JF, Sands BE, Narula N. Systematic review with meta-analysis: mucosal healing is associated with improved long-term outcomes in Crohn’s disease. Aliment Pharmacol Ther 2016;43:317-333.
4. Allocca M, Danese S, Laurent V, Peyrin-Biroulet L. Use of cross-sectional imaging for tight monitoring of inflammatory bowel diseases. Clin Gastroenterol Hepatol 2020;18:1309-1323.
5. D’Haens G, Ferrante M, Vermeire S, et al. Fecal calprotectin is a surrogate marker for endoscopic lesions in inflammatory bowel disease. Inflamm Bowel Dis 2012;18:2218-2224.
6. Bryant RV, Friedman AB, Wright EK, et al. Gastrointestinal ultrasound in inflammatory bowel disease: an underused resource with potential paradigm-changing application. Gut 2018;67:973-985.
7. Ripollés T, Poza J, Suarez Ferrer C, Martínez-Pérez MJ, Martín-Algíbez A, de Las Heras Paez B. Evaluation of Crohn’s disease activity: development of an ultrasound score in a multicenter study. Inflamm Bowel Dis 2021;27:145-154.
8. Castiglione F, Imperatore N, Testa A, et al. One-year clinical outcomes with biologics in Crohn’s disease: transmural healing compared with mucosal or no healing. Aliment Pharmacol Ther 2019;49:1026-1039.
9. Zhulina Y, Cao Y, Amcoff K, Carlson M, Tysk C, Halfvarson J. The prognostic significance of faecal calprotectin in patients with inactive inflammatory bowel disease. Aliment Pharmacol Ther 2016;44:495-504.
10. Colombel JF, Panaccione R, Bossuyt P, et al. Effect of tight control management on Crohn’s disease (CALM): a multicentre, randomised, controlled phase 3 trial. Lancet 2017;390:2779-2789.
12. Sipponen T, Savilahti E, Kolho KL, Nuutinen H, Turunen U, Färkkilä M. Crohn’s disease activity assessed by fecal calprotectin and lactoferrin: correlation with Crohn’s disease activity index and endoscopic findings. Inflamm Bowel Dis 2008;14:40-46.
13. Gecse KB, Brandse JF, van Wilpe S, et al. Impact of disease location on fecal calprotectin levels in Crohn’s disease. Scand J Gastroenterol 2015;50:841-847.
15. Makanyanga JC, Pendsé D, Dikaios N, et al. Evaluation of Crohn’s disease activity: initial validation of a magnetic resonance enterography global score (MEGS) against faecal calprotectin. Eur Radiol 2014;24:277-287.
16. Cerrillo E, Beltrán B, Pous S, et al. Fecal calprotectin in ileal Crohn’s disease: relationship with magnetic resonance enterography and a pathology score. Inflamm Bowel Dis 2015;21:1572-1579.
19. Jones GR, Fascì-Spurio F, Kennedy NA, et al. Faecal calprotectin and magnetic resonance enterography in ileal Crohn’s disease: correlations between disease activity and long-term follow-up. J Crohns Colitis 2019;13:442-450.
20. Lennard-Jones JE. Classification of inflammatory bowel disease. Scand J Gastroenterol Suppl 1989;170:2-6.
21. Vermeire S, Schreiber S, Sandborn WJ, Dubois C, Rutgeerts P. Correlation between the Crohn’s disease activity and Harvey-Bradshaw indices in assessing Crohn’s disease severity. Clin Gastroenterol Hepatol 2010;8:357-363.
23. Nylund K, Maconi G, Hollerweger A, et al. EFSUMB recommendations and guidelines for gastrointestinal ultrasound. Ultraschall Med 2017;38:273-284.
24. Fraquelli M, Colli A, Casazza G, et al. Role of US in detection of Crohn disease: meta-analysis. Radiology 2005;236:95-101.
25. Patriquin HB, Garcier JM, Lafortune M, et al. Appendicitis in children and young adults: Doppler sonographic-pathologic correlation. AJR Am J Roentgenol 1996;166:629-633.
26. Panés J, Bouzas R, Chaparro M, et al. Systematic review: the use of ultrasonography, computed tomography and magnetic resonance imaging for the diagnosis, assessment of activity and abdominal complications of Crohn’s disease. Aliment Pharmacol Ther 2011;34:125-145.
29. Turner D, Ricciuto A, Lewis A, et al. STRIDE-II: an update on the Selecting Therapeutic Targets in Inflammatory Bowel Disease (STRIDE) Initiative of the International Organization for the Study of IBD (IOIBD): determining therapeutic goals for treat-to-target strategies in IBD. Gastroenterology 2021;160:1570-1583.