Beunders, Gea
de Munnik, Sonja A
Van der Aa, Nathalie
Ceulemans, Berten
Voorhoeve, Els
Groffen, Alexander J
Nillesen, Willy M
Meijers-Heijboer, Elizabeth J
Frank Kooy, R http://orcid.org/0000-0003-2024-0485
Yntema, Helger G
Sistermans, Erik A
Article History
Received: 8 December 2013
Revised: 4 July 2014
Accepted: 10 July 2014
First Online: 10 September 2014
Competing interests
: The authors declare no conflict of interest.