Fig. 3

Analysis of countries and institutions. A The collaboration network shown on the world map. Darker blue indicates higher collaboration rates, the wider the link line, the higher the rate of collaboration between the two countries. B Analysis of collaboration among countries with more than three publications. C Analysis of collaboration among institutions with more than three publications. Clusters were identified by color, the size of the circles represent the number of publications, and the thickness of the lines shows the strength of the association