Liu, Xin https://orcid.org/0000-0001-5105-0532
Liao, Xia
Ren, Qiannan
Luo, Meng
Yang, Lei
Lin, Jing
Chang, Jie
Funding for this research was provided by:
Xi’an Jiaotong University (DW080038K0000004)
China Postdoctoral Science Foundation (2015M582678)
Health and Family Planning Commision of Shaanxi Province (2016D091)
Article History
Received: 27 December 2017
Accepted: 17 July 2018
First Online: 24 July 2018
Ethics approval and consent to participate
: The study protocol was approved by the Ethical Committee of Xi’an Jiaotong University Health Science Center (No. 2015-639). Written informed consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.
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