Published on in Vol 6 , No 8 (2018) :August
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/10063, first published
.

1 Department of Gynecology and Obstetrics, University Women's Clinic Heidelberg, Heidelberg, DE
2 Centre of Dentistry, Department of Orthodontics and Orofacial Orthopedics, University of Tuebingen, Tuebingen, DE