Article History
Received: 21 October 2018
Accepted: 7 December 2018
First Online: 12 December 2018
Compliance with ethical standards
:
: The authors declare that they have no competing interests.
: An ethical application for this project was approved by the Central Ethical Review Board at University of Gothenburg, case number 071-12, and all participants provided oral and written informed consent.
: This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.