Bernabe-Ortiz, A
Sanchez, J F
Carrillo-Larco, R M
Gilman, R H
Poterico, J A
Quispe, R
Smeeth, L
Miranda, J J
Article History
Received: 31 August 2015
Revised: 10 November 2015
Accepted: 23 November 2015
First Online: 11 February 2016
Competing interests
: The authors declare no conflict of interest.