Funding for this research was provided by:
Magnus Bergvalls Stiftelse (2017-02138)
Article History
Received: 11 June 2018
Accepted: 21 August 2018
First Online: 15 September 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The Regional Ethical Review Board in Stockholm, Sweden, approved the study and since this was a retrospective study formal consent was not required.