Chen, Ai http://orcid.org/0000-0003-3120-4949
Song, Liyao
Chen, Zhi
Luo, Xiaomei
Jiang, Qing
Yang, Zhan
Hu, Liangcai
He, Jinhua
Zhou, Lifang
Yu, Hai
Funding for this research was provided by:
National Medical Professional Degree Graduate Education Steering Committee (B2-YX20180304-10)
Sichuan Provincial Department of Education-Sichuan Medical Law Research Center (YF18-Y26)
Southwest Medical University (201710; JG2018096)
Department of Education of Sichuan Province (17ZB0470)
Sichuan Provincial Health and Family Planning Commission (15018)
Article History
Received: 1 April 2019
Accepted: 29 July 2019
First Online: 13 August 2019
Ethics approval and consent to participate
: The study protocol conformed to the ethical guidelines of the 1975 Declaration of Helsinki and was approved by the human research ethics committee of the Affiliated Hospital of Southwest Medical University in Sichuan Province. Since all samples were analyzed after a written informed consent obtained from all participants’ guardians, which saved in the record texts of the hospital and the study was retrospectively conducted, the informed consent requirement for the study was exempt due to restrained database access for analysis purposes only.
: Not applicable.
: The authors declare that they have no competing interests.