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a) Configuration of the sensor. Reproduced with permission.[ 154 ] Copyright 2019, Elsevier. b) OLED geometrics with the same active areas and the application of the fabricated sensor on the wrist. Reproduced with permission.[ 161 ] Copyright 2019, IEEE Access. c) Bottom: performance of the sensor. Up: for measuring SpO2 compared to a commercial sensor. Reproduced with permission.[ 168 ] Copyright 2020, Wiley‐VCH.
