Periampullary duodenal neuroendocrine tumor in a patient with neurofibromatosis-1: A case report

Table 1 Top 10 most productive countries

Country	Articles	SCP	MCP	Frequency	MCP ratio, %	TC	Average article citations
United States	1182	987	195	0.26302	16.50	30336	25.7
China	523	487	36	0.11638	6.88	4210	8.0
Italy	317	239	78	0.07054	24.61	6180	19.5
Japan	306	286	20	0.06809	6.54	3791	12.4
Germany	204	132	72	0.04539	35.29	3204	15.7
France	124	96	28	0.02759	22.58	3951	31.9
Korea	94	82	12	0.02092	12.77	1368	14.6
Spain	85	64	21	0.01891	24.71	869	10.2
Netherlands	66	39	27	0.01469	40.91	1367	20.7
Canada	49	36	13	0.01090	26.53	993	20.3

SCP: Single country publication; MCP: multiple country publication; TC: Total citation.

Table 2 Top 10 most productive affiliations

Affiliation	Articles
Fudan University	468
Memorial Sloan Kettering Cancer Center	246
The University of Texas MD Anderson Cancer Center	231
The Ohio State University	189
Stanford University	170
The University of Iowa	167
Zhejiang University	162
Sichuan University	152
Johns Hopkins University	148
Sun Yat Sen University	137

Table 3 Top 10 most productive journals

Sources	Articles
Neuroendocrinology	424
Pancreas	332
Journal of Clinical Oncology	149
Annals of Surgical Oncology	134
Modern Pathology	119
Laboratory Investigation	105
Gastroenterology	82
Gastrointestinal Endoscopy	81
Surgery	80
American Journal of Gastroenterology	78