Funding for this research was provided by:
Académie de recherche et d'enseignement supérieur (PRD2013, PRD2013, PRD2013)
Received: 28 November 2018
Accepted: 1 October 2019
First Online: 15 October 2019
Ethics approval and consent to participate
: The Bio-ethical Committee of the “Universidad Mayor de San Simón” approved the study protocol on October 30th, 2014. Each participant signed an inform consent form before enrollment.
: Not applicable.
: The authors declare that they have no competing interests.