It’s hard to convince institutions to release data locked up in EHRs (eg EPIC) due to the labor involved (EPIC is not well structured for this), risk of acciden

It’s hard to convince institutions to release data locked up in EHRs (eg EPIC) due to the labor involved (EPIC is not well structured for this), risk of accidentally leaking PHI, and general motivation (getting hold of useful data is the bread and butter for career researchers).