Zubair, N
Mayer-Davis, E J
Mendez, M A
Mohlke, K L
North, K E
Adair, L S
Article History
Received: 28 October 2013
Revised: 18 February 2014
Accepted: 20 February 2014
First Online: 16 June 2014
Competing interests
: The authors declare no conflict of interest.