1. Department of Cardiology, Cangzhou Central Hospital Affiliated of Tianjin Medical University, Cangzhou, Hebei 061014, China
2. Department of Cardiology, Shanxi Cardiovascular Hospital, Taiyuan, Shanxi 030024, China
3. Department of Cornea, Shanxi Ophthalmic Hospital, Taiyuan, Shanxi 030002, China