Ding, Y
Lawrence, N
Olié, E
Cyprien, F
le Bars, E
Bonafé, A
Phillips, M L
Courtet, P
Jollant, F
Article History
Received: 23 June 2014
Revised: 11 December 2014
Accepted: 19 December 2014
First Online: 24 February 2015
Competing interests
: The authors declare no conflict of interest.