[1] Hebei Med Univ, Dept Internal Med, Shijiazhuang, Peoples R China
[2] North China Univ Sci & Technol, Kailuan Hosp, Dept Cardiol, Tangshan, Peoples R China
[3] North China Univ Sci & Technol, Tangshan Peoples Hosp, Dept Cardiol, Tangshan, Peoples R China
[4] Hebei Med Univ, Tangshan Gongren Hosp, Dept Cardiovasol, Tangshan, Peoples R China
[5] Heidelberg Univ, Med Fac Mannheim, Dept Ophthalmol, Mannheim, Germany