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. 2022 Jan 18;12:925. doi: 10.1038/s41598-022-04867-y

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Number of present contact heat evoked potentials (CHEPs). (a) Number of present N2P2 and (b) N1 waveforms when stimulating the hand (left) and foot (right). The y-axis illustrates the number of subjects with absent (gray) and valid (black) CHEPs.