Teichert, Martina
Schermer, Tjard
van den Nieuwenhof, Lotte
De Smet, Peter AGM
Wensing, Michel
Article History
Received: 30 March 2014
Revised: 30 July 2014
Accepted: 30 August 2014
First Online: 16 October 2014
Competing interests
: The authors declare no conflict of interest.