Simple action potential measurement of cardiac cell sheet utilizing electronic sheet. - Takashi Ohya; Kazuki Nakazono; Tetsutaro Kikuchi; Daisuke Sasaki; Katsuhisa Sakaguchi; Tatsuya Shimizu; Kenjiro Fukuda; Takao Someya; Shinjiro Umezu (Artif. Life Robotics, 2018)