Published on in Vol 7 , No 7 (2019) :July
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/13844, first published
.

1 Department of Dermatology and Allergy, University Hospital, LMU Munich, Munich, DE
2 Department of Dermatology, University Hospital Heidelberg, University of Heidelberg, Heidelberg, DE