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. 2021 Jan 21;11:1956. doi: 10.1038/s41598-021-81492-1

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© The Author(s) 2021

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Strengthening of EHG burst. (a) A sliding window moving along the elevated EHG signal. The zero-crossing points are in red, and the sliding window is in blue. (b) The zero-crossing rate. (c) Power of zero-crossing rate.