Funding for this research was provided by:
Consejo Nacional de Ciencia y Tecnología (CB-2015-01)
Secretaría de Educación Pública (PFCE-SEP-2017 and 2018)
Consejo Nacional de Ciencia y Tecnología, Guatemala (777741, 296364)
Received: 7 December 2019
Accepted: 9 February 2020
First Online: 21 February 2020
Compliance with ethical standards
: The authors have no conflict of interest.
: This study was approved by the Bioethics Committee of the Universidad Autónoma de Guerrero and by the Research Department of the Instituto Estatal de Cancerología.
: Informed consent was obtained from all the participants.