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With the addition of modifiers in i2b2 version 1.6 (see: Data Model of Modifiers in i2b2) a more useful functionality for a undefined (meaning: not just financial encounter related) one-to-many relationship was introduced. Modifiers offer a way of bundling concepts in in the i2b2 hierarchy and give these concepts a unique (for that patient and encounter) subidentifier in the observation_fact to connect facts of one patient.
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