TABLE 1.

Top 10 countries by publications, citations and centrality.

Rank	Country	Publications	% of 8,238	Total Citations	Average Citations	H-index	Rank	Country	Centrality
1	United States	2,555	31.01	61,994	24.26	99	1	United States	0.28
2	China	1,128	13.69	11,146	9.88	42	2	Germany	0.24
3	Germany	781	9.48	19,570	25.06	66	3	France	0.15
4	Japan	729	8.85	9,205	12.63	42	4	Canada	0.15
5	Italy	536	6.51	10,597	19.77	46	5	Spain	0.14
6	England	504	6.12	17,361	34.45	60	6	Italy	0.12
7	Netherlands	489	5.94	12,171	24.89	56	7	England	0.12
8	France	416	5.05	10,314	24.79	49	8	Netherlands	0.06
9	Canada	408	4.95	13,706	33.59	52	9	Switzerland	0.06
10	Korea	373	4.53	4,450	11.93	31	10	Turkey	0.05