Funding for this research was provided by:
National Natural Science Foundation of China (31611130035,31371274, U1604165)
the Shanghai Municipal Commission of Science and Technology Program (14DJ1400101)
the Fourth Round of Shanghai Three-year Action Plan on Public Health Discipline and Talent Program: Women and Children’s Health (15GWZK0401)
VINNMER–Marie Curie international qualification (VINNOVA, 2015-04780)
the Swedish Medical Research Council (VR 2015-06276)
Swedish governmental grants to researchers in the public health service (ALFGBG-429271)
Text and Data Mining valid from 2018-06-25
Received: 13 June 2017
Accepted: 13 June 2018
First Online: 25 June 2018
Ethics approval and consent to participate
: Written informed consent was obtained from the parents or guardians on behalf of the infant participants. The study was approved by the Ethics Committee of Zhengzhou University and the Medical Academy of Henan Province in accordance with the principles of the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.
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