Tarp, Jakob http://orcid.org/0000-0002-9186-7077
Dalene, Knut Eirik
Steene-Johannessen, Jostein
Ekelund, Ulf
Article History
First Online: 28 December 2018
Compliance with ethical standards
:
: No sources of funding were used to assist in the preparation of this letter.
: Jakob Tarp, Knut Eirik Dalene, Jostein Steene-Johannessen and Ulf Ekelund declare that they have no conflicts of interest relevant to the content of this letter.