Tong, Lian
Ye, Yan
Yan, Qiong
Funding for this research was provided by:
the National Natural Science Foundation of China (81402693)
Shanghai Pujiang Program (14PJC012)
Shanghai Municipal Health Bureau (15GWZK0402)
Article History
Received: 10 January 2018
Accepted: 6 September 2018
First Online: 17 September 2018
Ethics approval and consent to participate
: This study was approved by the medical ethics committee of Fudan University (Shanghai, China). The corresponding author confirms that this study was performed by the approved social experiments guidelines and regulations. Prior to the survey, the informed consent forms were signed by parents if they agreed their children to attend to the survey.
: Not applicable.
: The authors declare that they have no competing interests.
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