Received: 11 April 2019
Accepted: 2 December 2019
First Online: 10 December 2019
Ethics approval and consent to participate
: The project was approved by the Regional Ethical Review Board in Uppsala (reg. no. 2011/061). All participants received written information about the aim and procedures, that participation was strictly voluntary, and could be discontinued at any time without explanation. The information was attached to the questionnaire and the participants gave their consent by completing the questionnaire.
: Not applicable.
: The authors declare that they have no competing interests.