Table 1.

The characteristics of studies included in the systematic review.

	Study	Publication year	Location	Population studied	Type of sample	IBD		CD		UC		Control
						SS of patients	SS of AIEC	SS of patients	SS of AIEC	SS of patient	SS of AIEC	SS of patient	SS of AIEC
1	Darfeuille-Michaud et al.	2004	France	IBD	B	90	18	90	18	-	-	118	3
2	Baumgart et al.	2007	USA	IBD	B	21	10	21	10	-	-	7	1
3	Medina et al.	2009	Spain	IBD	B	20	11	20	11	-	-	28	6
4	Raso et al.	2011	Italy	IBD	B	14	4	8	4	6	0	4	0
5	Negroni et al.	2012	Italy	IBD	B	34	2	24	1	10	1	23	0
6	Dogan et al.	2013	New York	IBD	B	32	8	32	8			28	5
7	Elliott et al.	2013	UK	IBD	B	45	2	30	2	15	0	14	0
8	Fuente et al.	2014	Chile	IBD	B	91	8	34	6	57	2	22	0
9	O'Brien et al.	2016	Australian	IBD	B	19	5	14	3	5	2	21	5
10	Cespedes et al.	2017	Spain/USA	IBD	B	24	13	24	13			8	0
11	Font et al.	2019	Spain	IBD	B	33	15	33	15	-	-	25	6
12	Lee et al.	2019	Korea	IBD	B	42	14	18	5	24	9	9	2
13	Abdelhalim et al.	2020	Turkey	IBD	B	24	10	24	10			15	7

B, Biopsy; CD, Crohn's disease; UC, ulcerative colitis; IBD, Inflammatory bowel disease; SS, Sample size.