Biering-Sørensen, F
Alai, S
Anderson, K
Charlifue, S
Chen, Y
DeVivo, M
Flanders, A E
Jones, L
Kleitman, N
Lans, A
Noonan, V K
Odenkirchen, J
Steeves, J
Tansey, K
Widerström-Noga, E
Jakeman, L B
Article History
Received: 23 September 2014
Revised: 4 December 2014
Accepted: 25 December 2014
First Online: 10 February 2015
Competing interests
: The authors declare no conflict of interest.