Funding for this research was provided by:
Dirección General de Asuntos del Personal Académico, Universidad Nacional Autónoma de México (PAPITT-IN201816.)
Consejo Nacional de Ciencia y Tecnología (CB-2014-01-239870)
Received: 29 July 2019
Accepted: 20 December 2019
First Online: 30 December 2019
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of Guerrero’s Secretariat of Health (Research Committee of the Guerrero State Health Services, Number 03301117).
: Not applicable.
: The authors declare they have no competing interests.