Retraction Retraction dated 2020-10-12

Article History

Received: 31 July 2019

Accepted: 23 October 2019

First Online: 9 December 2019

Change Date: 12 October 2020

Change Type: Correction

Change Details: This article has been retracted. Please see the Retraction Notice for more detail:

Change Details: https://doi.org/10.1186/s13018-020-02000-1

Change Details: .

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.