Aguirre, C A
Salazar, G D C
Lopez de Romaña, D V
Kain, J A
Corvalán, C L
Uauy, R E
Article History
Received: 10 February 2014
Revised: 25 April 2014
Accepted: 7 May 2014
First Online: 6 August 2014
Competing interests
: The authors declare no conflict of interest.