Zhang, Xinyi
Syeda, Zerin Imam
Jing, Zhengyue
Xu, Qiongqiong
Sun, Long
Xu, Lingzhong
Zhou, Chengchao http://orcid.org/0000-0002-9364-3579
Funding for this research was provided by:
National Natural Science Foundation of China (71003067)
Article History
Received: 19 December 2017
Accepted: 12 June 2018
First Online: 22 June 2018
Ethics approval and consent to participate
: The study protocol was approved by The Ethical Committee of Shandong University School of Public Health. The investigation was performed after the acquisition of informed consents of all participants.
: Not applicable.
: The authors declare that they have no competing interests.
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