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Authors
Zhang, Jiao
Xu, Lingzhong http://orcid.org/0000-0002-5068-4012
Li, Jiajia
Sun, Long
Qin, Wenzhe
Ding, Gan
Wang, Qian
Zhu, Jing
Yu, Zihang
Xie, Su
Zhou, Chengchao
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Funding
Funding for this research was provided by:
National Natural Science Foundation of China (71673169, 71673170)
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Article History
Received: 6 February 2019
Accepted: 22 July 2019
First Online: 31 July 2019
Ethics approval and consent to participate
: The survey was approved and organized by Health Commission of Shandong Province. This study was reviewed and approved by the Institutional Review Board (Academic Research Ethics Committee) of Shandong University School of Public Health. All procedures were in accordance with the ethical standards of the Helsinki Declaration. Participants provided informed consent prior to data collection.
: Not applicable.
: The authors declare that they have no competing interests.
