Funding for this research was provided by:
American Institute for Cancer Research (05B047)
Consejo Nacional de Ciencia y Tecnología (S0008-2009-1: 000000000115312)
Received: 28 September 2017
Accepted: 23 January 2018
First Online: 14 February 2018
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board at National Institute of Public Health of Mexico (INSP). All participants gave their consent to participate in this study.
: Not applicable
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.