[Head to head comparison of dobutamine alone and combined with nitrate stress echocardiography and 99mTc-MIBI/18FDG myocardial SPECT image for diagnosis of viable myocardium in patients with severe left ventricular dysfunction]. - Yang YJ; Yang WX; Shi RF; Hu FH; You SJ; Tian YQ; He ZX; Wang YW; Ye L; Chen JL; Gao RL; Chen ZJ (Zhonghua xin xue guan bing za zhi, 2005)