Michels, L.
Fossum, J. O.
Rozynek, Z.
Hemmen, H.
Rustenberg, K.
Sobas, P. A.
Kalantzopoulos, G. N.
Knudsen, K. D.
Janek, M.
Plivelic, T. S.
da Silva, G. J.
Article History
Received: 12 November 2014
Accepted: 29 January 2015
First Online: 5 March 2015
Competing interests
: The authors declare no competing financial interests.