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Haruki, N., Sumi, N., Kobara, S. et al. Spontaneous mitral valve perforation associated with mitral annular calcification-related calcified amorphous tumor assessed by three-dimensional transesophageal echocardiography. J Med Ultrasonics 47, 481–482 (2020). https://doi.org/10.1007/s10396-020-01023-9
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DOI: https://doi.org/10.1007/s10396-020-01023-9