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The ContextD algorithm uses pre-defined triggers to determine the values of the three contextual properties i.e. Negation, Temporality, and Experiencer. The negation property describes whether a clinical condition or term in the text is negated (i.e., does not exist). The temporality property places a condition along a time line. A condition is considered as recent if it is maximally 2 weeks old. Conditions developing more than 2 weeks ago are labeled as ‘Historical’. A condition is labeled as ‘Hypothetical’ if it does not satisfy conditions for Recent and Historical.
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