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Fig. 2 | BMC Public Health

Fig. 2

From: Particulate matter and atherosclerosis: a bibliometric analysis of original research articles published in 1973–2014

Fig. 2

Collaborative relationship network of the top 50 researchers. The size of the nodes represents the number of papers. The size of the lines represents the close degree of co-authors. The shapes of the nodes represent different countries (circle represents the US, down-triangle represents Germany, box represents Canada, up-triangle represents Finland, and diamond represents UK)

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