Global Research Trends in Shock Wave for Therapy from 1990 to 2019: A Bibliometric and Visualized Study

Figure 8

Co-occurrence analysis of global research about shock wave therapy. (a) Mapping of keywords in the research on shock wave therapy—the size of the points represents the frequency, and the keywords are divided into 7 clusters: “urology,” “hepatology,” “cardiology,” “orthopedics,” “mechanism research of shock wave therapy,” “andrology,” and “principle of shock wave therapy.” (b) Distribution of keywords according to the mean frequency of appearance—keywords in purple appeared earlier than those in green and yellow-colored keywords appeared later.

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