Astorga, César
Jorquera, Ramón A.
Ramírez, Mauricio
Kohler, Andrés
López, Estefanía
Delgado, Ricardo
Córdova, Alex
Olguín, Patricio
Sierralta, Jimena
Article History
Received: 2 December 2015
Accepted: 3 August 2016
First Online: 30 August 2016
Competing interests
: The authors declare no competing financial interests.