Doulougou, B
Gomez, F
Alvarado, B
Guerra, R O
Ylli, A
Guralnik, J
Zunzunegui, M V
Article History
Received: 15 January 2015
Revised: 23 February 2015
Accepted: 27 February 2015
First Online: 2 April 2015
Competing interests
: The authors declare no conflict of interest.