Stijnen, P
Brouwers, B
Dirkx, E
Ramos-Molina, B
Van Lommel, L
Schuit, F
Thorrez, L
Declercq, J
Creemers, J W M
Article History
Received: 29 June 2015
Revised: 3 December 2015
Accepted: 22 December 2015
First Online: 20 January 2016
Competing interests
: The authors declare no conflict of interest.