Published on in Vol 20, No 6 (2018): June
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/9262, first published
.

1 Division of Woman and Baby, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
2 Department of Clinical Chemistry and Hematology, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
*these authors contributed equally