Papers featured in the World Journal of Gastroenterology from 2006 to 2007

Table 1 Citation frequency of papers published in WJG 2006-2007

Cited times	No. of cited articles		No. of cited times
	Count	Percent (%)	Count	Percent (%)
1	493	25.11	493	5.61
2	396	20.17	792	9.01
3	270	13.75	810	9.22
4	175	8.91	700	7.97
5	160	8.15	800	9.10
6	107	5.45	642	7.31
7	77	3.92	539	6.13
8	56	2.85	448	5.10
9	41	2.09	369	4.20
10	42	2.14	420	4.78
11-20	111	5.65	1720	19.57
21-30	23	1.17	546	6.21
31-40	9	0.46	316	3.60
41-100	3	0.15	193	2.20
Total	1963	100.00	8788	100.00

Table 2 List of papers published in WJG 2006-2007 with over 30 citations

Rank	First author	Title	Sources	Cited times
1	Crew KD	Epidemiology of gastric cancer	12(3): 354-362, 2006	98
2	Sebastiani G	Non invasive fibrosis biomarkers reduce but not substitute the need for liver biopsy	12(23): 3682-3694, 2006	53
3	Kim KP	Diagnostic criteria for autoimmune chronic pancreatitis revisited	12(16): 2487-2496, 2006	42
4	Tamura G	Alterations of tumor suppressor and tumor-related genes in the development and progression of gastric cancer	12(2): 192-198, 2006	40
5	Alter MJ	Epidemiology of hepatitis C virus infection	13(17): 2436-2441, 2007	39
6	Dietrich CF	Assessment of metastatic liver disease in patients with primary extrahepatic tumors by contrast-enhanced sonography versus CT & MRI	12(11): 1699-1705, 2006	36
7	Smith MG	Cellular and molecular aspects of gastric cancer	12(19): 2979-2990, 2006	36
8	Lakatos PL	Recent trends in the epidemiology of inflammatory bowel diseases: Up or down?	12(38): 6102-6108, 2006	35
9	Engwegen JYMN	Identification of serum proteins discriminating colorectal cancer patients and healthy controls using surface-enhanced laser desorption ionisation-time of flight mass spectrometry	12(10): 1536-1544, 2006	34
10	Glebe D	Viral and cellular determinants involved in hepadnaviral entry	13(1): 22-38, 2007	34
11	Hocke M	Contrast-enhanced endoscopic ultrasound in discrimination between focal pancreatitis and pancreatic cancer	12(2): 246-250, 2006	31
12	Schaefer S	Hepatitis B virus taxonomy and hepatitis B virus genotypes	13(1): 14-21, 2007	31
13	Danese S	Etiopathogenesis of inflammatory bowel diseases	12(30): 4807-4812, 2006	30

Table 3 Papers and their frequency of citation, according to category

Category	2006			2007			Total			Total citation rate	Total cited times
	No. of papers	Papers cited	Cited times	No. of papers	Papers cited	Cited times	Count of papers	Papers cited	Cited times
Basic research	178	154	682	88	63	219	266	217	901	81.58	3.39
Case reports	216	167	477	208	105	226	424	272	703	64.15	1.66
Clinical research	93	84	454	67	49	176	160	133	630	83.13	3.94
Colorectal cancer	37	36	152	22	18	56	59	54	208	91.53	3.53
Editorial	85	82	664	58	50	255	143	132	919	92.31	6.43
Esophageal cancer	10	9	53	4	3	11	14	12	64	85.71	4.57
Gastric cancer	41	39	200	23	17	48	64	56	248	87.50	3.88
H pylori	17	14	34	10	9	15	27	23	49	85.19	1.81
Leading article	1	1	2			0	1	1	2	100.00	2.00
Letters to the editor	18	10	41	26	14	22	44	24	63	54.55	1.43
Liver cancer (cirrhosis)	34	30	171	27	21	59	61	51	230	83.61	3.77
Rapid communications	475	383	1593	391	268	773	866	651	2366	75.17	2.73
Reviews	75	72	860	37	32	136	112	104	996	92.86	8.89
Topic highlights	70	62	482	132	120	731	202	182	1213	90.10	6.00
Viral hepatitis	37	37	134	18	14	62	55	51	196	92.73	3.56
Other	1	0	0	7	0	0	8	0	0	0.00	0.00
Total	1388	1180	5999	1118	783	2789	2506	1963	8788	78.33	3.51

Table 4 Geographic distribution of cited authors

Rank	Area	Paper	No. of cited papers	Percent (%)	Cited times	Average citations per paper	Rank	Area	Paper	No. of cited papers	Percent (%)	Cited times	Average citations per paper
1	China	635	451	71.02	1499	2.36	16	Netherlands	28	24	85.71	126	4.50
2	Japan	299	230	76.92	1035	3.46	17	Canada	27	26	96.30	186	6.89
3	United States	188	156	82.98	910	4.84	18	Australia	26	23	88.46	142	5.46
4	Germany	162	141	87.04	863	5.33	19	Hungary	26	24	92.31	146	5.62
5	Italy	151	129	85.43	619	4.10	20	Brazil	22	17	77.27	60	2.73
6	Turkey	111	80	72.07	235	2.12	21	Mexico	22	17	77.27	46	2.09
7	South Korea	91	66	72.53	213	2.34	22	Poland	21	17	80.95	61	2.90
8	Greece	82	56	68.29	173	2.11	23	Sweden	18	16	88.89	83	4.61
9	India	68	54	79.41	204	3.00	24	Denmark	17	15	88.24	50	2.94
10	Taiwan, China	64	50	78.13	206	3.22	25	Serbia	17	13	76.47	26	1.53
11	Spain	56	49	87.50	286	5.11	26	Israel	13	11	84.62	62	4.77
12	England	52	39	75.00	169	3.25	27	Egypt	12	8	66.67	19	1.58
13	France	52	44	84.62	257	4.94	28	Belgium	11	8	72.73	46	4.18
14	Iran	44	34	77.27	100	2.27	29	Ireland	11	10	90.91	41	3.73
15	Thailand	29	24	82.76	72	2.48		Total	1832	2355	77.79	7935

Table 5 Year of citation for papers published in WJG 2006-2007

Publicationyear	2006			2007			2008			2009			Total
	Other citation	Self citation	Total	Other citation	Self citation	Total	Other citation	Self citation	Total	Other citation	Self citation	Total	Other citation	Self citation	Total
2006	130	37	167	1424	167	1591	2817	262	3079	1049	52	1101	5420	518	5938
2007				110	29	139	1585	195	1780	883	48	931	2578	272	2850
Total	130	37	167	1534	196	1730	4402	457	4859	1932	100	2032	7998	790	8788
Percent (%)	77.84	22.16	100	88.67	11.33	100	90.59	9.41	100	94.99	5.01	100	91.01	8.99	100

Table 6 Journals with a high number of citations from WJG 2006-2007

No.	Journals	Citations	Proportion (%)
1	World Journal of Gastroenterology	790	8.99
2	American Journal of Gastroenterology	104	1.18
3	Alimentary Pharmacology & Therapeutics	102	1.16
4	Gastrointestinal Endoscopy	101	1.15
5	Digestive diseases and Sciences	90	1.02
6	Hepatology	90	1.02
7	Journal of Gastroenterology and Hepatology	88	1.00
8	Inflammatory Bowel Diseases	82	0.93
9	Current Opinion in Gastroenterology	78	0.89
10	Gastroenterology	76	0.86
11	Gut	75	0.85
12	Liver International	67	0.76
13	Journal of Hepatology	64	0.73
14	International Journal of Cancer	55	0.63
15	Zeitschrift fur Gastroenterologie	54	0.61
16	European Journal of Gastroenterology & Hepatology	53	0.60
17	Pancreas	53	0.60
18	Revista Espanola de Enfermedades Digestivas	52	0.59
19	Journal of Gastroenterology	51	0.58
	Total	2125	24.18