1. Changzhou Center for Disease Control and Prevention , Changzhou 213022 , China
2. Jiangsu Provincial Center for Disease Control and Prevention , Nanjing 210009 , China
3. Wuxi Center for Disease Control and Prevention , Wuxi 214023 , China
4. Zhenjiang Center for Disease Control and Prevention , Zhenjiang 212002 , China
5. Nantong Center for Disease Control and Prevention , Nantong 226007 , China
6. Yancheng Center for Disease Control and Prevention , Yancheng 224001 , China
7. Xuzhou Center for Disease Control and Prevention , Xuzhou 221002 , China