Biering-Sørensen, F
DeVivo, M J
Charlifue, S
Chen, Y
New, P W
Noonan, V
Post, M W M
Vogel, L
Article History
Received: 8 February 2017
Revised: 11 April 2017
Accepted: 11 April 2017
First Online: 30 May 2017
Competing interests
: The authors declare no conflict of interest.