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. 2022 Sep 29;9:994534. doi: 10.3389/fmed.2022.994534

FIGURE 2.

FIGURE 2

Network of countries and regions engaged in GERD research. In the network map, a node represents a country or region. The larger the area of the node is, the larger the number of publications. The thicker the curved line connecting nodes indicates the frequency with which they co-occur, as they indicate collaborative relationships. An isolated node without any connection is devoid of all collaboration. A node with a high betweenness centrality links two or more large groups of nodes. A node with a high betweenness centrality score exerts a strong influence on the network. A purple trim indicates a high degree of betweenness centrality. Red tree rings indicate bursts of citation. The greater the thickness of the red tree rings, the greater the bursts for the corresponding node.