Verstraete, M
Debucquoy, A
Dekervel, J
van Pelt, J
Verslype, C
Devos, E
Chiritescu, G
Dumon, K
D'Hoore, A
Gevaert, O
Sagaert, X
Van Cutsem, E
Haustermans, K
Article History
Received: 19 November 2014
Revised: 4 December 2014
Accepted: 12 February 2015
First Online: 17 March 2015
Change Date: 14 April 2015
Change Type: Update
Change Details: This paper was modified 12 months after initial publication to switch to Creative Commons licence terms, as noted at publication
Competing interests
: The authors declare no conflict of interest.