Macias, M. Estimación Del Riesgo De Complicaciones Mayores Tras Bloqueo Neuroaxial: Cook TM, Counsell D, Wildsmith JAW. Major Complications of Central Neuraxial Block: Report on the Third National Audit Project of the Royal College of Anaesthetists. Br J Anaesth 2009; 102 (2): 179-90. Rev Elect AnestesiaR 2009, 1, 1.