Zhu, H
Bhagatwala, J
Pollock, N K
Parikh, S
Gutin, B
Stallmann-Jorgensen, I
Thomas, J
Harshfield, G A
Dong, Y
Article History
Received: 14 August 2014
Revised: 4 March 2015
Accepted: 4 April 2015
First Online: 14 April 2015
Competing interests
: The authors declare no conflict of interest.