Astorga-Eló, Marcia
Ramírez-Flandes, Salvador
DeLong, Edward F
Ulloa, Osvaldo
Article History
Received: 29 August 2014
Revised: 19 December 2014
Accepted: 31 December 2014
First Online: 20 February 2015
Change Date: 21 April 2015
Change Type: Correction
Change Details: This article has been corrected since Advance Online Publication and an erratum is also printed in this issue
Competing interests
: The authors declare no conflict of interest.