Funding for this research was provided by:
Natural Science Foundation of Fujian Province (2015J01363, 2015D015)
Collaborative Innovation Center for Maternal and Infant Health Service Application Technology.
Received: 24 August 2019
Accepted: 8 February 2021
First Online: 18 February 2021
Ethics approval and consent to participate
: Written informed consent was obtained from all participants in this study, and the study was approved by the Ethics Committee of the School of Medicine, Xiamen University.
: Not applicable.
: The authors have no conflicts of interest.