Received: 15 October 2019
Accepted: 2 January 2020
First Online: 13 January 2020
Ethics approval and consent to participate
: This study was approved by the Medical Ethics and Human Clinical Trial Committee, and Animal Use and Management Committee at Firs Jinan Women and Children Health Hospital.
: Consent for publication and Animal Use and Management Committee at Qilu Hospital of Shandong University. All authors agreed to publish the article in the journal.
: The authors declare that they have no competing interests.