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Efficiency of the attention networks in the bispectral index (BIS) monitored group (BIS group). Attention network (alerting, orienting, and executive control) functions in the bispectral index (BIS) group were assessed pre-operatively and at day 1 and day 5 postoperatively. * P<0.05 vs. corresponding pre-operative value; # P<0.05 vs. corresponding pre-operative value.
