1. Department of Internal Medicine, Wenfeng District Xiguan Subdistrict Office Community Health Center, Anyang, China
2. Hebei Medical University, Shijiazhuang, China
3. School of Clinical Medicine, Xiangnan University, Chenzhou, China
4. Catheterization Unit, Tangshan Gongren Hospital, Tangshan, China
5. Department of Cardiology, Tangshan Gongren Hospital, Tangshan, China
6. Department of Cardiology, Kailuan General Hospital, Tangshan, China