1. Department of Epidemiology and Biostatistics, School of Public Health, North China University of Science and Technology , Tangshan , China
2. Department of Cardiology, Kailuan General Hospital , Tangshan , China
3. Department of General Surgery, Zunhua Minzu Hospital , Tangshan , China
4. Department of Nutrition and Food Hygiene, School of Public Health, Institute of Nutrition, Fudan University , 130 Dong’an Road , Shanghai 200032, China