Published on in Vol 22, No 5 (2020): May
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/15773, first published
.
1 Department of Obstetrics and Gynaecology, Erasmus Medical Center, University Medical Center Rotterdam, Rotterdam, Netherlands
2 Department of Biostatistics, Erasmus Medical Center, University Medical Center Rotterdam, Rotterdam, Netherlands