1. Longobardi T, Jacobs P, Bernstein CN. Work losses related to inflammatory bowel disease in the United States: results from the National Health Interview Survey. Am J Gastroenterol 2003;98:1064-1072.
2. Cosnes J, Gower-Rousseau C, Seksik P, Cortot A. Epidemiology and natural history of inflammatory bowel diseases. Gastroenterology 2011;140:1785-1794.
4. Graff LA, Walker JR, Lix L, et al. The relationship of inflammatory bowel disease type and activity to psychological functioning and quality of life. Clin Gastroenterol Hepatol 2006;4:1491-1501.
5. Ng SC, Shi HY, Hamidi N, et al. Worldwide incidence and prevalence of inflammatory bowel disease in the 21st century: a systematic review of population-based studies. Lancet 2018;390:2769-2778.
8. Chmiel C, Vavricka SR, Hasler S, et al. Feasibility of an 8-item questionnaire for early diagnosis of inflammatory bowel disease in primary care. J Eval Clin Pract 2019;25:155-162.
12. Daniel WW, Cross CL. Biostatistics: a foundation for analysis in the health sciences. 7th ed. New York: John Wiley & Sons, 1999.
15. Satsangi J, Silverberg MS, Vermeire S, Colombel JF. The Montreal classification of inflammatory bowel disease: controversies, consensus, and implications. Gut 2006;55:749-753.
16. Agresti A, Coull BA. Approximate is better than “exact” for interval estimation of binomial proportions. Am Stat 1998;52:119-126.
18. Burisch J, Pedersen N, Čuković-Čavka S, et al. East-West gradient in the incidence of inflammatory bowel disease in Europe: the ECCO-EpiCom inception cohort. Gut 2014;63:588-597.
19. Belousova EA, Abdulganieva DI, Alexeeva OP, et al. Social and demographic characteristics, features of disease course and treatment options of inflammatory bowel disease in Russia: results of two multicenter studies. Almanac Clin Med 2018;46:445-463.
21. Kaplan GG, Ng SC. Understanding and preventing the global increase of inflammatory bowel disease. Gastroenterology 2017;152:313-321.
22. Kappelman MD, Rifas-Shiman SL, Kleinman K, et al. The prevalence and geographic distribution of Crohn’s disease and ulcerative colitis in the United States. Clin Gastroenterol Hepatol 2007;5:1424-1429.
26. Loftus EV Jr, Silverstein MD, Sandborn WJ, Tremaine WJ, Harmsen WS, Zinsmeister AR. Crohn’s disease in Olmsted County, Minnesota, 1940-1993: incidence, prevalence, and survival. Gastroenterology 1998;114:1161-1168.
28. Molodecky NA, Soon IS, Rabi DM, et al. Increasing incidence and prevalence of the inflammatory bowel diseases with time, based on systematic review. Gastroenterology 2012;142:46-54.
30. Winther KV, Jess T, Langholz E, Munkholm P, Binder V. Survival and cause-specific mortality in ulcerative colitis: follow-up of a population-based cohort in Copenhagen County. Gastroenterology 2003;125:1576-1582.
31. Burri E, Beglinger C. Faecal calprotectin in the diagnosis of inflammatory bowel disease. Biochem Med (Zagreb) 2011;21:245-253.
32. Puolanne AM, Kolho KL, Alfthan H, Ristimäki A, Mustonen H, Färkkilä M. Rapid faecal tests for detecting disease activity in colonic inflammatory bowel disease. Eur J Clin Invest 2016;46:825-832.
33. Brookes MJ, Whitehead S, Gaya DR, Hawthorne AB. Practical guidance on the use of faecal calprotectin. Frontline Gastroenterol 2018;9:87-91.