1. The First Dongguan Affiliated Hospital, Guangdong Medical University, Dongguan, China
2. The First Dongguan Affiliated Hospital, Guangdong Medical University; State Key Laboratory of Pathogenesis, Prevention and Treatment of High Incidence Diseases in Central Asia, Dongguan, China
3. Department of Epidemiology, School of Public Health, Sun Yat-sen University, Guangzhou, China
4. Department of Epidemiology and Medical Statistics, School of Public Health, Guangdong Medical University, Dongguan, China