Critical care. 40% of hospitals have no HDU.
D003365:Costs and Cost Analysis; D003422:Critical Care; D006757:Hospital Units / Q000191:economics / Q000706:statistics & numerical data / Q000600:supply & distribution*; D006779:Hospitals, Public / Q000458:organization & administration* / Q000706:statistics & numerical data; D013222:State Medicine; D006113:United Kingdom