Popp, Bernt
Støve, Svein I
Endele, Sabine
Myklebust, Line M
Hoyer, Juliane
Sticht, Heinrich
Azzarello-Burri, Silvia
Rauch, Anita
Arnesen, Thomas
Reis, André
Article History
Received: 25 February 2014
Revised: 13 June 2014
Accepted: 20 June 2014
First Online: 6 August 2014
Competing interests
: The authors declare no conflict of interest.