Efficient Bone Conduction Hearing Device With a Novel Piezoelectric Transducer Using Skin as an Electrode. - Ichiro Furuta; Hideaki Ogita; Fukuichiro Iguchi; Takayuki Okano; Kohei Yamahara; Tatsuya Namatsu; Shuichi Kawata; Koichi Omori; Norio Yamamoto (IEEE Trans. Biomed. Eng., 2022)