Johansson, Stefan http://orcid.org/0000-0002-7975-6198
Gulliksen, Jan http://orcid.org/0000-0002-2411-6417
Gustavsson, Catharina http://orcid.org/0000-0002-8709-4446
Funding for this research was provided by:
Post and Telecom Authority
The Swedish Consumer Agency
Article History
First Online: 7 March 2020
Compliance with ethical standards
:
: The authors declare that there are no conflicts of interest.