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Comment: add information about trained on clinical data. see http://incubator.apache.org/ctakes/components.html

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The relation extractor is designed to annotate relations between certain Event, Entity, and Modifier annotations.

It currently has been trained for detecting body site and severity, using machine learning with a model trained on manually annotated clinical data.

The default means of running the relation extractor is to use ctakes-relation-extractor/desc/analysis_engine/RelationExtractorAggregate.xml.