1. Department of Epidemiology and Biostatistics Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, School of Basic Medicine Peking Union Medical College Beijing China
2. Department of cardiology the second hospital of Qinhuangdao Qinhuangdao China
3. Department of Gastroenterology Kailuan General Hospital Tangshan China
4. Department of Employee Health Protection Tangshan China
5. Department of cardiology Kailuan General Hospital Tangshan China