Jakobsdottir, S
van Nieuwpoort, I C
van Bunderen, C C
de Ruiter, M B
Twisk, J W R
Deijen, J B
Veltman, D J
Drent, M L
Article History
Received: 17 October 2015
Revised: 21 March 2016
Accepted: 2 May 2016
First Online: 24 May 2016
Competing interests
: The authors declare no conflict of interest.