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. 2018 Jul 30;6(7):e10126. doi: 10.2196/10126

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©Annemarijn SM Steijlen, Kaspar MB Jansen, Armagan Albayrak, Derk O Verschure, Diederik F Van Wijk. Originally published in JMIR Mhealth and Uhealth (http://mhealth.jmir.org), 30.07.2018.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in JMIR mhealth and uhealth, is properly cited. The complete bibliographic information, a link to the original publication on http://mhealth.jmir.org/, as well as this copyright and license information must be included.

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Placement of the electrodes of the standard 12-lead electrocardiographic system; LA: left arm; LL: left leg; RA: right arm; RL: right leg; V1 to V6: the 6 precordial electrodes.