Fig. 2. Network connectivity of the top 50 keywords (The nodes’ colors were represented based on betweenness centrality values: the top 10 are in red, rankings 11∼20 in orange, 21∼30 in yellow, 31∼40 in green, and 41∼50 in blue). As the frequency of co-occurrence increases, the thicker links between nodes in the network appear.
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