He, Huijing
Pan, Li
Du, Jianwei
Liu, Feng
Jin, Yuming
Ma, Jingang
Wang, Li
Jia, Pengben
Hu, Zhiping
Shan, Guangliang http://orcid.org/0000-0002-4535-8941
Funding for this research was provided by:
the Key Basic Research Program of the Ministry of Science and Technology of China (2013FY114100)
CAMS Innovation Fund for Medical Sciences (2016-I2M-2-004, 2018-I2M-1-001)
Article History
Received: 17 January 2019
Accepted: 31 March 2019
First Online: 10 April 2019
Ethics approval and consent to participate
: Ethics approval was obtained from the Bioethical Committee of Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences. All participants provided written informed consent by their parents before the survey.
: This manuscript does not contain any individual person’s data in any form.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.