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In the editorial titled "Hemodynamic Disturbances in Macroglobulinemia and Myeloma," published April 28 (208:686), the first sentence refers to a recent editorial and cites the American Heart Journal as the source. The journal in which the cited editorial appeared is Circulation, as given in the list of references.
Circulation. JAMA. 1969;209(1):107. doi:10.1001/jama.1969.03160140063016