Romney, D., Fox, H., Carlson, S. et al. (2020). Allocation of Scarce Resources in a Pandemic: A Systematic Review of U.S. State Crisis Standards of Care Documents. (Abstract only; email email@example.com for access to the full article.) Disaster Medicine and Public Health Preparedness.
The authors reviewed crisis standards of care documents to determine how many contained all five elements recommended by the Institute of Medicine and how those elements were incorporated. Out of 31 documents they included in their analysis, five contained all five elements.