[1] Univ Hong Kong, LKS Fac Med, Dept Opthalmol, Hong Kong, Hong Kong, Peoples R China
[2] North China Univ Sci & Technol, Tangshan Peoples Hosp, Dept Cardiol, Tangshan, Peoples R China
[3] North China Univ Sci & Technol, Kailuan Hosp, Dept Hlth Care Ctr, Tangshan, Peoples R China
[4] North China Univ Sci & Technol, Kailuan Hosp, Dept Cardiol, Tangshan, Peoples R China
[5] North China Univ Sci & Technol, Hosp, Dept Ultrasonog, Tangshan, Peoples R China
[6] Chinese Acad Med Sci, Fuwai Hosp, Natl Ctr Cardiovasc Dis, State Key Lab Cardiovasc Dis,Dept Hyertens, Beijing, Peoples R China
[7] Peking Union Med Coll, Beijing, Peoples R China