Retraction Retraction dated 2021-02-01

Article History

Received: 10 August 2019

Accepted: 9 December 2019

First Online: 6 January 2020

Change Date: 17 February 2021

Change Type: Correction

Change Details: A Correction to this paper has been published:

Change Details: https://doi.org/10.1186/s13048-020-00747-z

Ethics approval and consent to participate

: The present study was approved by the Ethics Committee of the Maternity and Child Care Center of Liuzhou. The research has been carried out in accordance with the World Medical Association Declaration of Helsinki. All patients and healthy volunteers provided written informed consent prior to their inclusion within the study.

: Not applicable.

: The authors declare that they have no competing interests.