van der Plasse, G
van Zessen, R
Luijendijk, M C M
Erkan, H
Stuber, G D
Ramakers, G M J
Adan, R A H
Article History
Received: 18 February 2015
Revised: 8 June 2015
Accepted: 12 July 2015
First Online: 17 July 2015
Competing interests
: The authors declare no conflict of interest.