Brisebarre, A
Kumulungui, B
Sawadogo, S
Afridi, S
Fumoux, F
Rihet, P
Article History
Received: 13 June 2014
Revised: 16 October 2014
Accepted: 16 October 2014
First Online: 18 December 2014
Competing interests
: The authors declare no conflict of interest.