title: An examination of alternative emergency ambulance systems: contributions from an economic geography perspective.
mesh_terms: D000552:Ambulances / Q000600:supply & distribution*; D004632:Emergency Medical Services / Q000191:economics*; D004777:Environment; D006297:Health Services Accessibility / Q000191:economics; D006801:Humans; D008962:Models, Theoretical; D013597:Systems Analysis; D014481:United States; D014504:Urban Health