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. 2020 Oct 20;10:17839. doi: 10.1038/s41598-020-75032-6

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© The Author(s) 2020

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Bipolar and unipolar electrogram at the site with earliest activation time below PV. (A) The point with special potential, (B) the point without special potential. In both figures, bipolar electrograms of distal pair were presented as the upper white line.