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Authors
Dong, Hongyun http://orcid.org/0000-0002-1033-5395
Zhang, Qiong
Liu, Guangzeng
Shao, Tingguo
Xu, Yingzhi
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Funding
Funding for this research was provided by:
Health Commission of Shandong Province
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Article History
Received: 22 November 2018
Accepted: 4 April 2019
First Online: 23 April 2019
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of Shouguang People’s Hospital and Health Commission of Shandong Province affiliated with the People’s Government of Shandong Province. All participation in the study was voluntary and written informed consent was obtained from the participants.
: 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.
