1. Department of Biostatistics and Epidemiology; School of Public Health; China Medical University; Shenyang Liaoning China
2. Department of Epidemiology; College for Public Health and Social Justice; Saint Louis University; Saint Louis MO USA
3. Department of Biostatistics; College for Public Health and Social Justice; Saint Louis University; Saint Louis MO USA
4. Institute of Epidemiology and Preventive Medicine; College of Public Health; National Taiwan University; Taipei Taiwan
5. Atmosphere pollution control center of Liaoning province; Shenyang Liaoning China
6. Department of Preventive Medicine; School of Public Health; Sun Yat-sen University; Guangzhou Guangdong China