Department of Epidemiology and Health Statistics,School of Public Health, Shandong University,Jinan,People's Republic of China. Department of Epidemiology and Biostatistics,Tianjin Medical University Cancer Institute and Hospital,Tianjin,People's Republic of China. Independent Consultant,New York,USA. Department of Cardiology,Jiangyin People's Hospital,Jiangyin,People's Republic of China. Department of Preventive Medicine and Public Health,School of Medicine, University of Navarra,Pamplona,Spain. Department of Endocrinology,Linyi People's Hospital,27 East part of Jiefang Road,276003Linyi,People's Republic of China.