Otten, Ellen
Birnie, Erwin
Lucassen, Anneke M
Ranchor, Adelita V
Van Langen, Irene M
Article History
Received: 6 February 2015
Revised: 25 March 2015
Accepted: 27 March 2015
First Online: 22 April 2015
Competing interests
: The authors declare no conflict of interest.