Text and Data Mining valid from 2019-10-08
Received: 7 July 2019
Accepted: 28 September 2019
First Online: 8 October 2019
Ethics approval and consent to participate
: Approval for the study was granted by the local ethics committee (EK 51012019).
: Informed consent was obtained from all individual participants included in the study.
: The authors declare that they have no competing interests.