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In the original contribution, "Electrocardiographic Effects of Marihuana," published in the July 2 issue (225:25-27, 1973), Fig 2 on page 27 was printed upside-down. On page 58 in the same issue, editorial comment on the article was published.
ECG Tracing Upside-Down. JAMA. 1973;225(10):1230. doi:10.1001/jama.1973.03220380046010