Funding for this research was provided by:
National Natural Science Foundation of China (81874266, 81673183)
key project from Shanghai Municipal Science and Technology Commission (18411951600)
the Science and Technology Funds from Pudong New Area, Shanghai (PKJ2017-Y01)
the Research Funds from Shanghai Jiao Tong University School of Medicine (20170509-1)
the Scientific Research Development Funds from Xinhua Hospital, Shanghai Jiao Tong University School of Medicine (HX0251)
Text and Data Mining valid from 2019-11-21
Received: 22 April 2019
Accepted: 27 September 2019
First Online: 21 November 2019
Ethics approval and consent to participate
: The ethical application and consent procedure of this study were approved by the Ethics Committee of Shanghai Jiao Tong University School of Medicine (Approval number: SJUPN-201717). All eligible infant and their mother were invited to participate in the study. Only those mothers who had signed a written informed consent and gave a written consent for their children to participate in the study participated, and filled in the parental behaviors and environmental exposure questionnaire (PBEQ).
: Not applicable.
: The authors declare that they have no competing interests.