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. 2022 May 10;112(2):237–246. doi: 10.1007/s10470-022-02037-8

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Fig. 4 — a Experimental setup: extension board (green) is attached to the Nucleo-64 development board (white) in the form of a sandwich panel while three output channels stimulate the cymba conchae region of the external ear using miniature needle electrodes. b Standalone setup for wearable applications