Russell, Michael Bjørn
Article History
First Online: 19 March 2019
Compliance with ethical standards
:
: The author declares that he has no conflict of interest.
: This is a review article–based paper. The reference studies comply with the ethical standards. 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. Informed consent was obtained from all individual participants included in the study.