ter Horst, K W
van Galen, K A
Gilijamse, P W
Hartstra, A V
de Groot, P F
van der Valk, F M
Ackermans, M T
Nieuwdorp, M
Romijn, J A
Serlie, M J
Article History
Received: 30 November 2016
Revised: 16 March 2017
Accepted: 19 April 2017
First Online: 3 May 2017
Competing interests
: The authors declare no conflict of interest.