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Printed heart rate and oxygen saturation sensors. (I) shows the screen-printed ECG sensor on TPU film; the left figure shows the placement of the 4 electrodes, while the figure on the right shows a volunteer wearing the device; reused with permission from [279], Copyright (2019), John Wiley & Sons. (II) shows the inkjet-printed pulse oximeter while performing live monitoring on a human subject [188], used under the terms of Creative Common CC BY license.
