Hupfeld, Line http://orcid.org/0000-0002-5865-2939
Pommergaard, Hans-Christian
Burcharth, Jakob
Rosenberg, Jacob
Article History
Accepted: 2 May 2018
First Online: 22 May 2018
Compliance with ethical standards
: Data retrieval and analysis was approved by the Danish Data Protection Agency (number HEH-2013-056).