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(a) Piezoelectric necklace. Reprinted with permission from Ref. [95]. Copyright 2015, Elsevier. (b) Pressure-sensing piezoelectric device. Reprinted with permission from Ref. [96]. Copyright 2015, MDPI. (c) Biodegradable piezoelectric. Reprinted with permission from Ref. [98]. Copyright 2018, National Academy of Science. (d) Installation of the piezoelectric device on a curved balloon. Reprinted with permission from Ref. [23]. Copyright 2019, Wiley.
