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To further assess the robustness of the findings , sensitivity analyses were performed , including the use of ( a ) only 1 medication episode for each patient , the one with which the patient was treated first , and ( b ) all medication episodes , including those simultaneously initiated on more than 1 antipsychotic . Although this potential bias cannot be ruled out by statistical methods , we attempted to address physicians ' potential preference to switch patients to olanzapine soon after patients ' enrollment in the study . K + secretion and the generation of the endocochlear potential were measured using electrophysiological techniques . She is horrified , the only character responding sympathetically to the execution . To help address potential selection bias of the treatment groups , we identified , a priori , a set of available covariates that were used in the Cox Proportional Hazards regression model ( covariates are listed later in this section ) .