Table 3. Centrality ranking of institutions (top 8).

Rank	Institutions	Centrality
1	University of Adelaide	0.11
2	Pennsylvania State University	0.05
3	University of Pennsylvania	0.04
4	Virginia Commonwealth University	0.04
5	Yale University	0.03
6	Pennsylvania State College of Medicine	0.03
7	Monash University	0.02
8	Heilongjiang University of Chinese Medicine	0.02