Liu, Zhao-Yan
Tan, Xu-Ying
Li, Qi-Jiong
Liao, Gong-Cheng
Fang, Ai-Ping
Zhang, Dao-Ming
Chen, Pei-Yan
Wang, Xiao-Yan
Luo, Yun
Long, Jing-An
Zhong, Rong-Huan
Zhu, Hui-Lian
Funding for this research was provided by:
National Natural Science Foundation of China (81773415, 81472966)
Article History
Received: 18 September 2018
Accepted: 7 November 2018
First Online: 20 November 2018
Ethics approval and consent to participate
: Written informed consent was provided by all study participants, and the study protocol was approved by the Ethics Committee of the School of Public Health at Sun Yat-sen University.
: Not applicable.
: The authors declare that they have no competing interests.
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