1. Department of Fundamental and Community Nursing, School of Nursing, Nanjing Medical University, Nanjing, China
2. Jiangsu College of Nursing, School of Nursing and Midwifery, Huaian, China
3. Nanjing Municipal Center for Disease Control and Prevention, Nanjing, China
4. Jiangsu Provincial Center for Disease Control and Prevention, Nanjing, China