Ackroyd and colleagues’ study[1][1] links epidural analgesia with negative postoperative outcomes based on a propensity matching model intended to remove the bias present in observational datasets. We question their approach… Click to show full abstract
Ackroyd and colleagues’ study[1][1] links epidural analgesia with negative postoperative outcomes based on a propensity matching model intended to remove the bias present in observational datasets. We question their approach for several reasons. First, covariates used to create their model are not
               
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