Paalman, C H
van Leeuwen, F E
Aaronson, N K
de Boer, A G E M
van de Poll-Franse, L
Oldenburg, H S A
Schaapveld, M
Article History
Received: 29 June 2015
Revised: 30 October 2015
Accepted: 5 November 2015
First Online: 12 January 2016
Competing interests
: The authors declare no conflict of interest.