Study population and data collection using the Observational Medical Outcomes Partnership Common Data Model (OMOP-CDM)
A single-center long-term cohort study using the OMOP-CDM was used for a retrospective analysis of clinical data from Hallym University, Kangdong Sacred Heart Hospital, Seoul, South Korea. Patient-level data were transformed into a common data format that enabled identical study execution. De-identified data were from electronic medical records and were transformed into the OMOP-CDM format.19 The Institutional Review Board of Hallym University provided approval for the analysis (IRB 2019-09-005).