,
Nooijen, C F J
Vogels, S
Bongers-Janssen, H M H
Bergen, M P
Stam, H J
van den Berg-Emons, H J G
Article History
Received: 11 September 2014
Revised: 12 March 2015
Accepted: 17 March 2015
First Online: 21 April 2015
Competing interests
: The authors declare no conflict of interest.