“…In other examples, unpublished data were used to provide contextual information (other than effectiveness or harms/safety information); for example, to detail uptake of services, patient characteristics, epidemiology, natural history, or cost or data for cost-effectiveness analyses. [19][20][21][22][23] In some instances, the rationale for using unpublished data was not evident and/or appeared opportunistic (i.e., researchers had access to their own unpublished data and included it because it was available), and was not applied to healthcare decision making. Overall the examples we identified applied clinical practice data or specific registry data from a single health system (e.g., Mayo Clinic) or regional or nationally representative data (e.g., clinical registries, hospital database).…”