Fig. 4From: Disease causality extraction based on lexical semantics and document-clause frequency from biomedical literatureCausal disease network: In the causal disease network, each node denotes a disease, and the color of the node represents the MeSH category. The size of the node is determined by the number of influencing diseases on the disease. The edge with an arrow shows the prior–posterior relationship of two diseases, and its width represents the causality strengthBack to article page