Correction to: BMC Pregnancy Childbirth 20, 660 (2020)

https://doi.org/10.1186/s12884-020-03351-7

Following publication of the original article [1], the authors informed us that the first affiliation has been provided incorrectly. In this Correction, correct and incorrect version is shown.

Incorrect: “Department of medical administration, Beijing University Shenzhen Hospital, Shenzhen 518036, China.”

Correct: “Peking University Shenzhen Hospital, Shenzhen 518036, China.”

The original article has been corrected.