van Dam van Isselt, Eléonore F
Spruit, Monica
Groenewegen-Sipkema, Karin H
Chavannes, Niels H
Achterberg, Wilco P
Article History
Received: 29 October 2013
Revised: 27 January 2014
Accepted: 9 February 2014
First Online: 20 May 2014
Competing interests
: The authors declare no conflict of interest. NHC is an Associate editor of the PCRJ, but was not involved in the editorial review of, nor the decision to publish, this article.