Table 6

Top countries by centrality

Rank	Country	Occurrences	Weighted degree	Page rank	Eigen centrality	Closeness centrality	Betweenness centrality
1	UK	5770	27.0	0.062	1.0	0.933	0.250
2	USA	2506	26.0	0.060	0.98	0.903	0.229
3	Netherlands	666	22.0	0.047	0.95	0.8	0.049
4	Canada	567	18.0	0.039	0.83	0.717	0.024
5	Switzerland	409	18.0	0.039	0.85	0.717	0.015
6	Italy	85	17.0	0.037	0.78	0.7	0.024
7	Spain	481	17.0	0.037	0.82	0.7	0.011
8	Australia	37	16.0	0.036	0.76	0.682	0.024
9	Sweden	315	16.0	0.036	0.77	0.682	0.023
10	Germany	121	16.0	0.036	0.71	0.682	0.020