Xie, Hai Qin
Zhang, Wei Wei
Sun, De Sheng
Chen, Xiang Mei
Yuan, Shu Fang
Gong, Zheng Hua https://orcid.org/0000-0001-9074-8036
Liu, Li
Funding for this research was provided by:
the Science Technology and Innovation Commission of Shenzhen Municipality in China (JCYJ20170413100222613)
the Health and Family Planning Commission of Shenzhen Municipality in China (SZSM201512026)
Article History
Received: 31 December 2018
Accepted: 2 April 2019
First Online: 11 April 2019
Ethics approval and consent to participate
: Not applicable.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.