First Online: 24 June 2019
Compliance with Ethical Standards
: The author declares that he has no conflict of interest.
: The study was registered and approved by the Danish Data Protection Agency and informed consent was obtained from all individual participants included in the study.
: The study involved human participants and all procedures were performed in accordance with the Policy for Responsible Conduct of Research and Code of Practice at Aarhus University and the Principles on Responsible Scientific Conduct at Aarhus BSS. All procedures were also in accordance with the Danish Code of Conduct for Research Integrity (2014) which is based on international declarations and principles for research integrity and responsible research practice including the European Code of Conduct for Research Integrity (2011).