Vermeulen, E
Stronks, K
Visser, M
Brouwer, I A
Snijder, M B
Mocking, R J T
Derks, E M
Schene, A H
Nicolaou, M
Article History
Received: 17 September 2016
Revised: 15 March 2017
Accepted: 28 March 2017
First Online: 3 May 2017
Competing interests
: The authors declare no conflict of interest.