Fransen, B L
Hosman, A J
van Middendorp, J J
Edwards, M
van Grunsven, P M
van de Meent, H
Article History
Received: 26 January 2015
Revised: 22 May 2015
Accepted: 27 May 2015
First Online: 14 July 2015
Competing interests
: The authors declare no conflict of interest.