Article History
Received: 18 September 2018
Accepted: 27 October 2018
First Online: 7 November 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This study was approved by the data protection official at OUH (<i>ePhorte 2015-5042</i>). All 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. This study does not contain any studies with animals performed by any of the authors.
: For this type of study, formal consent is not required.