[1] Lanzhou Univ, Lanzhou Univ Second Hosp, Lanzhou, Peoples R China
[2] Kailuan Gen Hosp, Dept Cardiol, 57 Xinhua East Rd, Tangshan 063000, Hebei, Peoples R China
[3] Lanzhou Univ Second Hosp, Dept Cardiol, 82 Cuiyingmen, Lanzhou 730000, Gansu, Peoples R China