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In the Original Contribution entitled "Cognitive Functioning of Long-term
Heavy Cannabis Users Seeking Treatment" published in the March 6, 2002, issue
of THE JOURNAL (2002;287:1123-1131), the legend for the Figure should indicate
that error bars represent SEM, not SD.
Incorrect Measure. JAMA. 2002;287(13):1651. doi:10.1001/jama.287.13.1651