Funding for this research was provided by:
Skåne County Council's Research and Development Foundation (ALF 2017)
Text and Data Mining valid from 2018-10-11
Received: 9 September 2018
Accepted: 8 October 2018
First Online: 11 October 2018
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: The study was approved by the Regional Ethical Review Board in Lund (Dnr 2009/659, Dnr 2014/681), and complies with the current laws of Sweden. The study has been performed in accordance 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.