Funding for this research was provided by:
Det Sundhedsvidenskabelige Fakultet, Københavns Universitet
Received: 1 February 2019
Accepted: 15 May 2019
First Online: 25 May 2019
Compliance with ethical standards
: On behalf of all the authors, the corresponding author states that there is no conflict of interest.
: All the procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.