1. Department of Epidemiology Jiann‐Ping Hsu College of Public Health, Georgia Southern University Statesboro Georgia USA
2. Department of Biostatistics Jiann‐Ping Hsu College of Public Health, Georgia Southern University Statesboro Georgia USA
3. Shanghai East Hospital, Tongji University, School of Medicine Shanghai China
4. Department of Social Medicine, School of Public Health Fudan University Shanghai China