Received: 17 November 2019
Accepted: 4 May 2020
First Online: 5 June 2020
Ethics approval and consent to participate
: The study was carried out in accordance with the recommendations and approval of the Regional Committee for Medical Research Ethics of South East Norway, University of Oslo, Norway, study number 2016/388. All subjects were informed about the study and gave a written informed consent in accordance with the Declaration of Helsinki.
: All authors have read through the final version of the manuscript and given consent for publication in BMC Psychology.
: There are no conflicting interests with industrial companies or commercialization of products in the study. The researchers receive no economic benefits from the project.