Department of Epidemiology and Statistics;
The Graduate School of the Chinese PLA General Hospital;
Beijing 100853;
China;
Health Care Division;
Security Bureau of Headquarters of the General Staff;
Beijing 100017;
China;
Department of Senior Citizens Welfare;
Beijing College of Social Administration;
Beijing 100029;
China;
Smoking; Obesity; Coronary heart disease; Combined effect; Cohort study;