1. Department of Epidemiology and Biostatistics, College of Public Health, Zhengzhou University, Zhengzhou, Henan, People's Republic of China
2. Department of Social Medicine and Health Management, College of Public Health, Zhengzhou University, Zhengzhou, Henan, People's Republic of China
3. Department of General Practice, The Affiliated Luohu Hospital of Shenzhen University Medical School, Shenzhen, Guangdong, People's Republic of China
4. Department of Biostatistics and Epidemiology, School of Public Health, Shenzhen University Medical School, Shenzhen University, Shenzhen, Guangdong, People's Republic of China