Wang, Ji-Wei
Zhang, Cheng-Gang
Deng, Qing-Long
Chen, Wan-Li
Wang, Xian
Yu, Jin-Ming
Article History
Received: 1 November 2017
Accepted: 27 March 2018
First Online: 12 April 2018
Ethics approval and consent to participate
: Ethical approval to conduct this study was granted by the Medical Research Ethics Committee of the School of Public Health, Fudan University (Protocol number RB #2013–04-0450). A written informed consent was obtained from each participant.
: Not applicable.
: The authors declare that they have no competing interest.
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