Anthias, C
van Walraven, S M
Sørensen, B S
de Faveri, G N
Fechter, M
Cornish, J
Bacigalupo, A
Müller, C
Boo, M
Shaw, B E
Article History
Received: 11 September 2014
Revised: 28 December 2014
Accepted: 31 December 2014
First Online: 2 March 2015
Competing interests
: The authors declare no conflict of interest.