Funding for this research was provided by:
National Natural Science Foundation of China (81460394)
Shenzhen science and technology innovation committee foundation (JCYJ20160429172357927)
Sanming Project of Medicine in Shenzhen (SZSM201406007)
Text and Data Mining valid from 2019-06-24
Received: 18 February 2019
Accepted: 31 May 2019
First Online: 24 June 2019
Ethics approval and consent to participate
: This study was approved by the Shenzhen Bao’an Maternity and Child Health Hospital’s ethics committee (the committee’s reference number: QKTLL-2017-05-04). The authors declare that all samples involved in the study were collected with the written informed consents were obtained from the parents of infants. And there were no adolescent mothers (under the age of 18) in this study.
: Not applicable.
: The authors declare that they have no competing interests.