Published on in Vol 7 , No 2 (2019) :Apr-Jun
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/12713, first published
.

1 Helios Amper Klinikum, Dachau, Germany
2 University of Ulm, Ulm, Germany
3 Obstetrics and Gynecology Department, University of Ulm, Ulm, Germany