1. Department of Pediatrics, The First Affiliated Hospital, Medical School of Xi'an Jiaotong University, Xi'an, Shaanxi Province, China.
2. Hubert Department of Global Health, Rollins School of Public Health, Emory University, Atlanta, Georgia.
3. Lab Center of Public Health Department, School of Medicine, Xi'an Jiaotong University, Xi'an, Shaanxi Province, China.
4. Department of Nursing, School of Medicine, Xi'an Jiaotong University, Xi'an, Shaanxi Province, China.
5. College of Medicine, Xi'an Jiaotong University, Xi'an, Shaanxi Province, China.
6. Department of Statistics and Epidemiology, School of Medicine, Xi'an Jiaotong University, Xi'an, Shaanxi Province, China.