[nradov]

Yes, very true. Beyond just access to clinical data there are often major differences between how the same conditions are recorded between different provider organizations based on EHR data models and local practices. Researchers who want to use data from multiple organizations typically have to put a huge amount of work into their data pipelines for cleansing and normalization. Some standards development organizations such as HL7 (including their various FHIR accelerators) are now writing more detailed and specific implementation guides to improve data quality and consistency so I would encourage technologists to contribute to those projects.