Mårell, Lena
Bergdahl, Jan
Tillberg, Anders
Stenberg, Berndt
Berglund, Anders
Funding for this research was provided by:
Umea University
Article History
Received: 15 June 2016
Accepted: 15 October 2018
First Online: 27 October 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The study was approved by the Ethics Committee of Umeå University, Umeå, Sweden. All procedures in this prospective study were conducted in accordance with the Declaration of Helsinki (1964) and its later amendments.
: Informed consent was obtained from all individual participants included in the study.