“…As a result of this experience, CDRN participants had sophisticated data models and processes in place that could be adapted for use in PCORnet. In fact, some CDRN partners were primarily 37 Fleurence, Curtis, et al, 2014b;Fleurence, Beal, et al, 2014a. 38 Fleurence, Curtis, et al, 2014b;Engleberg Center for Health Care Reform at Brookings, 2014. 39 Fleurence, Curtis, et al, 2014b. 40 Fleurence, Curtis, et al, 2014b. 41 ETL "is a process in which programmers extract data from one or more data sources, transform the data to fit certain requirements or specifications, and then load the data into a desired location. In the context of PCORnet, CDRN and PPRN database programmers extract the data needed to populate the PCORnet common data model from the data sources which house the necessary information, transform their data to fit into the common data model, and then load that transformed data into a defined location" (PCORnet Central Desktop, undated).…”