Table 1.

Top 10 countries by the number of publications.

Count	Centrality	First publication year	Country
367	0.38	2003	PR China
86	0.38	2000	USA
50	0.13	2007	India
38	0.32	2001	Australia
34	0.15	2003	Germany
31	0.19	2006	Spain
16	0.01	2005	Brazil
16	0.1	2001	Canada
15	0	2001	Argentina
11	0.12	2015	Belgium