Xu A Q, Zhang L
Expanding Program of Immunization Division, Shandong Center for Disease Control and Prevention, Shandong Provincal Key Laboratory of Infectious Disease Control and Prevention, Jinan 250014, China.
Zhonghua Yu Fang Yi Xue Za Zhi. 2017 Jun 6;51(6):457-461. doi: 10.3760/cma.j.issn.0253-9624.2017.06.001.