Fig. 3

Geographical distribution (A) and visualization of countries (B) and organizations (C) on research of PCD in ONFH. Note: The color of the circles represent different clusters, the number of circles represents the number of countries/organizations analyzed, and the size of the circles represents the proportion of the country/organizations in the analysis: The larger the circle, the greater the contribution. The connections between the circles represent the connections between countries/organizations, and the more or thicker the connections, the closer the connections between the two