TY  - RPRT
TI  - Emergency department categorization: a historical perspective.
AU  - R H Cales
PY  - 2000
DO  - 10.1111/j.1553-2712.2000.tb01904.x
UR  - https://pubmed.ncbi.nlm.nih.gov/10894253/
ID  - 10894253
ER  -