Funding for this research was provided by:
AFA Försäkring
Article History
Received: 13 March 2018
Accepted: 6 July 2018
First Online: 11 July 2018
Compliance with ethical standards
:
: Markus Jansson-Fröjmark, Jonas Evander and Sven Alfonsson declares that they have no conflict of interests to report.
: All procedures were in accordance with the ethical standards of the institutional research committees and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all individual participants included in the study.