Introduction of Inactivated Poliovirus Vaccine and Impact on Vaccine-Associated Paralytic Poliomyelitis — Beijing, China, 2014–2016
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R. Ma | Shuyan Zuo | Li Lu | Dan Zhao | Wei Yao | Jianqi Yin | Xiaomei Li | Fan Yang | Jinhua Wu | Tao Zhou | Hao Sun | Fang Liu