[Study on Impedance of Implantable Cardiac Pacemaker in Unipolar/Bipolar Pacing Mode by in Vitro Experiment]. - Ding D; Lin KB; Huang D; Guo XW; Wang YP; Li S; Li JB; Niu JH (Zhongguo yi liao qi xie za zhi = Chinese journal of medical instrumentation, 2022)