After the publication of this work [1], we became aware that it contains inaccurate description. The correct description on page 5 was “At every timepoint, statistically significant differences were observed between IM olanzapine and IM placebo groups (p < .01) (Figure one)”, and not “At every timepoint, statistically significant differences were observed between IM olanzapine and IM placebo groups (p < .001) (Figure one).” We regret any inconvenience that this inaccuracy might have caused.