1. Department of Diarrhea Diseases; National Institute for Communicable Diseases Prevention and Control, China Center for Disease Prevention and Control (China CDC); PO Box 5 Changping Beijing 102206 China
2. State Key Laboratory for Infectious Disease Prevention and Control (China CDC); PO Box 5 Changping Beijing 102206 China
3. Center for Disease Prevention and Control; Jiangsu Province China
4. Center for Disease Prevention and Control; Henan Province China
5. Center for Disease Prevention and Control; Anhui Province China
6. Center for Disease Prevention and Control; Shandong Province China
7. Center for Disease Prevention and Control; Xuzhou City Jiangsu Province China