Text and Data Mining valid from 2019-07-29
Received: 8 January 2019
Revised: 12 July 2019
Accepted: 16 July 2019
First Online: 29 July 2019
Compliance with ethical statements
: The authors declare that they have no conflict of interest.
: Institutional approval for the study was granted by the Local Research Ethics Committee (EK-number 2471/1) in accordance with internationally accepted ethical standards.
: Informed consent was obtained from all individual participants included in the study.