Bergkamp, Tom L. G. http://orcid.org/0000-0001-5522-1247
Niessen, A. Susan M.
den Hartigh, Ruud. J. R.
Frencken, Wouter G. P.
Meijer, Rob R.
Article History
First Online: 10 February 2018
Compliance with Ethical Standards
:
: Tom L. G. Bergkamp, A. Susan M. Niessen, Ruud J. R. den Hartigh, Wouter G. P. Frencken, and Rob R. Meijer have no conflicts of interest directly relevant to the content of this letter.