Li, X
Zhang, K
Pajewski, N M
Brill, I
Prentice, H A
Shrestha, S
Kilembe, W
Karita, E
Allen, S
Hunter, E
Kaslow, R A
Tang, J
Article History
Received: 12 September 2014
Revised: 19 December 2014
Accepted: 19 December 2014
First Online: 29 January 2015
Competing interests
: The authors declare no conflict of interest.