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For each :STUDY_PAT_ID:, a random date shift of +/- 180 days was chosen, and all identified patient data that are linked to the :STUDY_PAT_ID: (i.e. from EHR and Natus) were adjusted.
A pseudo identifier with a consistent crosswalk to the true identifier retained by the source Data Partner. For analytical data sets requiring patient-level data, only the pseudo identifier is used to link across all information belonging to a patient.