Funding for this research was provided by:
National Natural Science Foundation of China (81522040, 81473051)
the Program for HUST Academic Frontier Youth Team
Text and Data Mining valid from 2018-09-17
Received: 2 March 2018
Accepted: 10 September 2018
First Online: 17 September 2018
Ethics approval and consent to participate
: The study approved by Ethics and Human Subject Committee of the School of Public Health, Tongji Medical College, and Dongfeng General Hospital, the Dongfeng Motor Corporation. All participants provided written informed consents.
: Not applicable.
: The authors declare that they have no competing interests.
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