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. 2021 Nov 29;3:765867. doi: 10.3389/fdgth.2021.765867

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Copyright © 2021 Mallick, Biser, Haridas, Umesh, Tönsing, Yari, Ollenschläger, Heckel, Ostgathe, Kluge, Eskofier and Steigleder.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) TFM setup: measuring BR, 4 other electrodes (light blue) measuring HR, (B) SP setup: 2 electrodes (dark blue) measuring BR, 3 electrodes (light blue) measuring HR. During the study the electrodes of the SP are placed closer after every iteration, which is schematically shown with the black arrows.