Funding for this research was provided by:
Received: 12 January 2017
Accepted: 21 January 2018
First Online: 30 January 2018
Ethics approval and consent to participate
: According to the National Committee on Health Research Ethics in Denmark formal ethics approval is not required because no human biological material was sampled. The study was carried out in accordance with current Danish rules of ethics and legislature and has been approved by the Danish Data Protection Agency, 23rd May 2013, record number 2013-41-1960.A written agreement outlining the aim and extent of the research was signed by the involved parties. Oral permission was always obtained to record meetings and interviews during the fieldwork.
: Not applicable.
: The authors declare they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.