Table 2.

Top 12 keywords of relevant literature of IBD diagnosis.

Rank	Related researches in nearly 10 years				Rank	Citation classics
	Keywords	Freq	Keywords	Centrality		Keywords	Freq	Keywords	Centrality
1	inflammatory bowel disease	4281	Inflammatory bowel disease	0.03	1	inflammatory bowel disease	56	inflammatory bowel disease	0.78
2	Crohn’s disease	3250	diagnostic accuracy	0.03	2	ulcerative colitis	41	Crohn’s disease	0.73
3	ulcerative colitis	2601	natural history	0.02	3	Crohn’s disease	34	ulcerative colitis	0.2
4	diagnosis	2042	rheumatoid arthritis	0.02	4	quality of life	10	colorectal cancer	0.16
5	management	1098	clostridium difficile infection	0.02	5	colorectal cancer	9	rheumatoid arthritis	0.12
6	prevalence	739	antibody	0.02	6	clostridium difficile infection	8	quality of life	0.09
7	risk	649	prediction	0.02	7	risk factor	7	risk factor	0.09
8	children	627	calprotectin	0.02	8	management	7	primary sclerosing cholangitis	0.07
9	risk factor	556	ct enterography	0.02	9	evidence based consensus	6	clostridium difficile infection	0.06
10	therapy	554	receptor	0.02	10	primary sclerosing cholangitis	6	chronic kidney disease	0.06
11	epidemiology	454	prognosis	0.02	11	diagnosis	5	genome wide association	0.06
12	colorectal cancer	429	genome wide association	0.02	12	follow up	5	diagnosis	0.05