Boer, J M
van der Veer, A
Rizopoulos, D
Fiocco, M
Sonneveld, E
de Groot-Kruseman, H A
Kuiper, R P
Hoogerbrugge, P
Horstmann, M
Zaliova, M
Palmi, C
Trka, J
Fronkova, E
Emerenciano, M
do Socorro Pombo-de-Oliveira, M
Mlynarski, W
Szczepanski, T
Nebral, K
Attarbaschi, A
Venn, N
Sutton, R http://orcid.org/0000-0002-0188-6005
Schwab, C J
Enshaei, A
Vora, A
Stanulla, M
Schrappe, M
Cazzaniga, G
Conter, V
Zimmermann, M
Moorman, A V
Pieters, R
den Boer, M L
Article History
Received: 13 May 2015
Revised: 8 July 2015
Accepted: 13 July 2015
First Online: 23 July 2015
Competing interests
: The authors declare no conflict of interest.