Funding for this research was provided by:
The Research Project of Health Department of Jiangxi Province (20174057)
Received: 22 February 2020
Accepted: 15 June 2020
First Online: 29 June 2020
Ethics approval and consent to participate
: The patients were ascertained under the Ethics Committee of Ganzhou Maternal and Child Health Hospital. Before the sample collection, the patients signed the written informed consents.
: Consent for publication was given.
: The authors declare that they have no competing interests.