Updates are available Correction dated 2021-02-08

Article History

Received: 30 September 2020

Accepted: 10 November 2020

First Online: 19 November 2020

Change Date: 8 February 2021

Change Type: Correction

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

Change Details: https://doi.org/10.1186/s12911-020-01379-5

Ethics approval and consent to participate

: Ethics approval has been granted by the Ethics Committee of Chengdu Jinjiang Maternity and Child Health Hospital (Approval number: 201908). Signed informed consent will be sought from all participants. Confidentiality of information collected will be strictly maintained throughout the study. The trial database will be de-identified, password protected and only accessible by the research team. Only approved study investigators have access to the identifiable data on a need-to-know basis for study purposes (i.e. to conduct questionnaire interviews). The aggregated data and findings of this study will be reported at national and international academic conferences and be disseminated in peer-reviewed journals.

: Not applicable.

: The authors declare that they have no competing interests.