Journal:
:anesthesiology and pain medicine
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jason lie department of anaesthesia, royal albert edward infirmary, wigan, uk; corresponding author: jason lie, specialty trainee (st6) in anaesthesia, department of anaesthesia, royal albert edward infirmary, wigan, uk. tel: +44-7795212989, fax: +44-1942244000, e-mail:
manjula yadagiri department of anaesthesia, royal albert edward infirmary, wigan, uk
catherine aspinall department of anaesthesia, royal albert edward infirmary, wigan, uk
