Gerke, Oke http://orcid.org/0000-0001-6335-3303
Ehlers, Karen
Motschall, Edith
Høilund-Carlsen, Poul Flemming
Vach, Werner
Article History
First Online: 23 April 2019
Compliance with Ethical Standards
: For this type of study, formal consent is not required.
: The authors declare that they have no conflict of interest.