Received: 14 February 2020
Accepted: 9 June 2020
First Online: 16 June 2020
Ethics approval and consent to participate
: Ethical approval for the VeCaS database was obtained from the regional Medical Research Ethics Committee Maastricht (nr 09–4-061). Because of its non-invasive nature, this type of research does not require further ethical approval in the Netherlands. Verbal informed consent was obtained from each woman before extracting the data from the medical file to VeCaS. The extracted data are anonymized and cannot be related to individual women.
: Not Applicable.
: One of the authors, dr. M. Nieuwenhuijze, is a member of the editorial board of BMC Pregnancy and Childbirth.