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Acknowledgements
The authors thank all the members of the structural heart team: Mai Terada, MD, Kanako Kishiki, MD, Jun Shimizu, MD, Nobuo Iguchi MD and Shuichiro Takanashi, MD.
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Higuchi, R., Mahara, K., Saji, M. et al. Severe functional mitral regurgitation manifested by isometric handgrip: revival of simple and non-invasive stress test in the era of transcatheter mitral valve repair. Cardiovasc Interv and Ther 35, 417–418 (2020). https://doi.org/10.1007/s12928-019-00634-5
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DOI: https://doi.org/10.1007/s12928-019-00634-5