Correction to: BMC Pregnancy Childbirth

https://doi.org/10.1186/s12884-019-2430-4

Following publication of the original article [1], the author mentioned that two additional NIH staff were involved in the development of the protocol who did not receive recognition in the Acknowledgments section in their published article. He would like to add the following people to the Acknowledgements section:

  • Martha Nason and Erin Gabriel

The publisher apologizes for any inconvenience caused by this error.