Pérez, Wilton http://orcid.org/0000-0002-9109-2224
Contreras, Mariela
Peña, Rodolfo
Zelaya, Elmer
Persson, Lars-Åke
Källestål, Carina
Article History
Received: 5 July 2018
Accepted: 31 August 2018
First Online: 18 September 2018
Ethics approval and consent to participate
: The ethical review board of biomedical research at the National Autonomous University of León approved the HDSS data collection (FWA00004523/IRB0000334 ACTA No. 81). Informed verbal consent was obtained from the participants. They were free to end participation at any time.
: Not applicable.
: The authors declare no competing interest.
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