Text and Data Mining valid from 2019-11-21
Received: 15 October 2018
Accepted: 15 October 2019
First Online: 21 November 2019
Ethics approval and consent to participate
: The project was approved by the Regional Committee for Medical and Health Research Ethics West (Reference number REK 127.97) and performed in accordance with the Declaration of Helsinki. Writtten informed consent was obtained from all the participants in this study.
: Not applicable.
: We declare that none of the authors have any competing interests.