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Opinion mining is a well-known problem in natural language processing that has attracted increasing attention in recent years. Existing approaches are mainly limited to the identification of direct opinions and are mostly dedicated to explicit opinions. However, in some domains such as medical, the opinions about an entity are not usually expressed by opinion words directly, but they are expressed indirectly by describing the effect of that entity on other ones. Therefore, ignoring indirectdoi:10.1371/journal.pone.0124993 pmid:25962135 pmcid:PMC4427363 fatcat:6e5ckqmcb5cadgwtsbrs4feeu4