Nagelkerke, S Q
Tacke, C E
Breunis, W B
Geissler, J
Sins, J W R
Appelhof, B
van den Berg, T K
de Boer, M
Kuijpers, T W
Article History
Received: 30 March 2015
Revised: 17 May 2015
Accepted: 29 May 2015
First Online: 1 September 2015
Competing interests
: The authors declare no conflict of interest.