Funding for this research was provided by:
NORFACE (Grant No.462-14-091)
Internal instituional funding
Text and Data Mining valid from 2019-01-20
Received: 13 July 2018
Revised: 26 November 2018
Accepted: 14 December 2018
First Online: 20 January 2019
Compliance with ethical standards
: All authors declare no conflict of interest.
: Ethical approval was obtained from the University of Bremen ethics committee.
: Informed consent was obtained from all individual participants included in the study.