van Helvoort, Hanneke AC
Willems, Laura M
Dekhuijzen, PN Richard
van Hees, Hieronymus WH
Heijdra, Yvonne F
Article History
Received: 22 December 2015
Revised: 21 April 2016
Accepted: 6 June 2016
First Online: 13 October 2016
Competing interests
: The authors declare no conflict of interest.