Funding for this research was provided by:
Consejo Nacional de Ciencia y Tecnología (819707)
Received: 14 November 2018
Accepted: 13 May 2019
First Online: 22 May 2019
Ethics approval and consent to participate
: Data collection and molecular analysis were approved by the Research and Ethics Committees at Instituto Nacional de Medicina Genómica (INMEGEN).
: The parents signed a letter of consent to participate in the study and all children assented. They also gave their authorization for the publication of the results.
: The authors declare that they have no competing interests.
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