Niu, Peihua
Qi, Shunxiang
Yu, Benzhang
Zhang, Chen
Wang, Ji
Li, Qi
Ma, Xuejun
Article History
Received: 8 March 2016
Accepted: 11 July 2016
First Online: 30 July 2016
Compliance with ethical standards
:
: All aspects of the study were performed in accordance with national ethics regulations and appraised by the Institutional Review Boards of the Center for Disease Control and Prevention of China. Children’s parents were apprised of the study’s purpose and of their right to keep information confidential. Written informed consent was obtained from parents or caregivers.
: This study was funded by the China Mega-Project for Infectious Disease (2016ZX10004001-002, 2016ZX10004-001), Beijing Municipal Science & Technology Commission Project (D151100002115003), and Guangzhou Municipal Science & Technology Commission Project (2015B2150820)
: All authors declare that they have no competing interests.
: The views expressed in this article are those of the authors and do not necessarily represent the views of the Chinese Center for Disease Control and Prevention.
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