Funding for this research was provided by:
Received: 15 August 2019
Accepted: 27 July 2020
First Online: 17 August 2020
Ethics approval and consent to participate
: This project was approved by the ethics committees of the maternity hospitals involved (protocols in public hospital 1.288.088/2015 and in private hospital 1.204.288/2015). All participants signed an informed consent form.
: Not applicable.
: The authors declare that they have no competing interests.