Human studies of a piezoelectric transducer and a microphone for a totally implantable electronic hearing device. - Zenner,H.P.; Leysieffer,H.; Maassen,M.; Lehner,R.; Lenarz,T.; Baumann,J.; Keiner,S.; Plinkert,P.K.; McElveen,J.T. (Am J Otol, 2000)