Text and Data Mining valid from 2019-11-29
Received: 28 June 2019
Accepted: 19 November 2019
First Online: 29 November 2019
Ethics approval and consent to participate
: The study has been approved by the Regional Committee for Medical and Health Research Ethics (REK 2014/940). Written informed consent was obtained from all participants.
: Not applicable.
: The first author, Agnete Egilsdatter Kristoffersen is a member of the editorial board (Associate Editor) of BMC Complementary and Alternative Medicine.