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In the article by Captain John E. Leach entitled "Effect of Roentgen Therapy on the Heart: A Clinical Study," which appeared in the December 1943 issue (Arch. Int. Med.72:715, 1943), the word "arrhythmia" is spelled, incorrectly, without the "h."
Effect of Roentgen Therapy on the Heart: A Clinical Study. Arch Intern Med (Chic). 1944;73(3):270. doi:10.1001/archinte.1944.00210150073026