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A) Comparisons of the size, power, and safety limits of miniature devices used in in vivo experiments shows a range of devices sizes and powers. B) The safety limits vary for each type of WPT and, in some cases, devices already operate at or near the limits which limits the transmitter power. C,D) Increasing the size of the implant can also increase the generated power. (References: a[ 50 ] b[ 13 ] c[ 15 ] d[ 12 ] e[ 11 ] f[ 14 ] g[ 42 ] h[ 26 ] i[ 23 ])
