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Authors
Rong, Yu-Dong
Bian, Ai-Lin
Hu, Hui-Ying
Ma, Yue
Zhou, Xin-Zi
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Funding
Funding for this research was provided by:
Science and Technology Fund of Tianjin city health and Family Planning Commission (15KG132)
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Article History
Received: 22 March 2018
Accepted: 5 December 2018
First Online: 12 December 2018
Ethics approval and consent to participate
: This study was conducted in accordance with the Declaration of Helsinki. This study was approved by the Ethics Committee of Tianjin First Central Hospital. All participants were provided with details on the purpose of this study and how the collected data were used. Written informed consent was obtained from all participants prior to their inclusion in the study.
: Not applicable.
: The authors have no competing interests to declare.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
