Table 1. Countries that have research...

Table 1.

Countries that have research collaborations

Countries	Frequency	Years	Centrality
USA	163	1996	0.39
China	87	2000	0.04
England	64	1997	0.26
Spain	63	2006	0.16
Australia	54	1991	0.09
Canada	44	1998	0.12
Portugal	27	2010	0.04
Russia	27	2015	0.07
Germany	22	2006	0.16
Turkey	20	2005	0.07

Source(s): Authors’ own work

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