The authors bring to the reader's attention that Figure 2 in their paper  was inspired by Figure 1 in the paper by Khouri et al. . Authorization for this adaptation has been obtained from the owner of the copyright in the original work.
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2. Khouri MG, Peshock RM, Ayers CR, de Lemos JA, Drazner MH. A 4-tiered classification of left ventricular hypertrophy based on left ventricular geometry: the Dallas heart study. Circ Cardiovasc Imaging