Fig. 6

Characteristics of highly cited and co-citation articles on miRNAs and IDD. A Overlay visualization of highly cited documents. A node represents a highly cited document. The size of the node is directly proportional to the number of times it is cited. The cold or warm colours represent the time point of the literature published. Cheng (2018a), Wang (2011), and Cheng (2018b) ranked top three in terms of citations. Wang (2011) was the earliest research paper published. B Visual network map of cited articles. Different colours represent different clusters. C Visual network map of co-citation articles. Different colours represent different clusters. The node represents the co-citation article. The size of the node is directly proportional to the number of times the co-citation article was cited. D Visual density view of co-cited references. The yellow-green colour represents the co-citation article, whose density is positively correlated with the number of citations