©Heidi 
Holmen, 
Astrid 
Klopstad 
Wahl, Milada 
Cvancarova 
Småstuen, 
Lis Ribu. 
Originally 
published 
in the Journal 
of Medical
Internet 
Research 
(http://www
.jmir.org), 23.06.2017. 
This is an open-access 
article 
distributed 
under 
the terms 
of the Creative
Commons 
Attribution 
License 
(https://creativecommons.or
g/licenses/by/4.0/), 
which 
permits 
unrestricted 
use, distribution, 
and
reproduction 
in any medium, 
provided 
the original 
work, 
first published 
in the Journal 
of Medical 
Internet 
Research, 
is properly
cited. 
The complete 
bibliographic 
information, 
a link to the original 
publication 
on http://www
.jmir.org/, as well as this copyright
and license 
information 
must be included
Med mindre annet er angitt, så er denne innførselen lisensiert som ©Heidi Holmen, Astrid Klopstad Wahl, Milada Cvancarova Småstuen, Lis Ribu. Originally published in the Journal of Medical Internet Research (http://www .jmir.org), 23.06.2017. This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.or g/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in the Journal of Medical Internet Research, is properly cited. The complete bibliographic information, a link to the original publication on http://www .jmir.org/, as well as this copyright and license information must be included