[1] Harbin Med Univ, Affiliated Hosp 1, Cardiovasc Inst, Dept Cardiol, 23 Postal St, Harbin 150001, Heilongjiang, Peoples R China
[2] Harbin Med Univ, Cardiovasc Inst, Affiliated Hosp 1, Cardiac Ultrasound Div, Harbin, Heilongjiang, Peoples R China
[3] Harbin Med Univ, Cardiovasc Inst, Affiliated Hosp 2, Dept Gen Practice, Harbin, Heilongjiang, Peoples R China
[4] Harbin Med Univ, Affiliated Hosp 1, Cardiovasc Inst, Dept Geriatr, Harbin, Heilongjiang, Peoples R China