Document is current

Article History

Received: 8 February 2018

Accepted: 16 October 2018

First Online: 24 October 2018

Ethics approval and consent to participate

: According to the local and national ethical instructions for research (Finnish Advisory Board on Research Integrity:() instructions, this study did not require ethical approval. The autonomy and of research subjects was respected, there was informed consent, no harm was possible for the subjects and confidentiality of the subjects, and research data were protected.

: Not applicable.

: The authors declare that they have no competing interests.

: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.