Non-invasive cardiac output measurement with electrical velocimetry in patients undergoing liver transplantation: comparison of an invasive method with pulmonary thermodilution oleh De-Jie Wang, I-Shan Lee, An-Hsun Chou, Chun-Yu Chen, Pei-Chi Ting, Yun-Hui Teng, Jr-Rung Lin, Hsin-I Tsai