1. State Key Laboratory of Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China.
2. Child Healthcare Department, Shenzhen Nanshan Maternity and Child Health Care Hospital, Shenzhen, China.
3. Plague Prevention and Control Department, Akesai Kazak Autonomous County Center for Disease Control and Prevention, Jiuquan, China.
4. Institute for Plague and Brucellosis Prevention and Control, Gansu Provincial Center for Disease Control and Prevention, Lanzhou, China.