Central neuraxial block: defining risk more clearly.
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D000767:Anesthesia, Epidural / Q000009:adverse effects*; D000775:Anesthesia, Spinal / Q000009:adverse effects*; D006801:Humans; D008485:Medical Audit; D018570:Risk Assessment / Q000379:methods; D013222:State Medicine / Q000592:standards / Q000706:statistics & numerical data; D006113:United Kingdom