Funding for this research was provided by:
Consejo Nacional de Ciencia y Tecnología (Ciencia Básica 2013-1-222972)
Fondo de Investigación en Salud (FIS), Instituto Mexicano del Seguro Social. (FIS/IMSS/PROT/G13/1189)
Received: 18 June 2018
Accepted: 7 January 2019
First Online: 14 January 2019
Ethics approval and consent to participate
: This study was approved by the National Commission for Scientific Research form the Instituto Mexicano del Seguro Social (IMSS) with the number R-2012-785-179. All patients gave their written informed consent. Collection of specimens used in our study complied with institutional guidelines, it was not necessary to request any permission.
: Not applicable.
: The authors declare that they have no competing interests.
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