Enhancement: Utilize generated cohort lists in other cohorts

[TomWhite-MedStar]

Problem Statement

We often have patient populations that can't be fully defined as OHDSI cohorts that we want to incorporate into other cohorts and downstream analyses. For example, we have populations based upon participation in hospital-specific quality improvement programs. We may also define populations based upon regex or NLP of clinical notes. In both cases, we'd like to characterize those populations and use them in PLE and PLP.

In many cases, we have clinical opportunity or safety questions we want to explore same/next day using OHDSI to do the heavy lifting. If we had the ability to have an OHDSI cohort definition reference another cohort as part of the definition, we could support that need.

Specifically, we could use external tools and data to create a table conforming to the OHDSI cohort schema (e.g. cohort_definition_id, person_id , cohort_start_date, cohort_end_date), and map our identifiable data to the de-identified OHDSI person_id value, and assign a cohort_definition_id value in a locally reserved numbering range. This would enable us to iterate multiple times per day on such cohort definitions, and then use our OMOP data (which is refreshed less frequently) to better understand and manage that clinical population.

Desired Behavior

Create an Atlas widget called Add Cohort with attributes Cohort Number, Cohort Start Date Criteria, and Cohort End Date Criteria. There should also be Cohort Name, which can either be free text (for externally defined cohorts) or auto-filled from the name of existing cohorts defined within the user's Atlas instance. This widget should be available in Cohort Entry Event, Inclusion Criteria, and Cohort Exist (plus Reusables).

It may be helpful to also have a check box for "Use Entire Population if Cohort Does Not Exist".