Funding for this research was provided by:
Instituto Mexicano del Seguro Social (FIS/IMSS/PROT/PRIO 12/018)
Received: 7 July 2017
Accepted: 10 June 2018
First Online: 18 June 2018
Ethics approval and consent to participate
: The research protocol was approved by the Ethics and Scientific Commission of IMSS (R2011–785-056). An informed written consent was signed by each willing participant or by a representative. Patients were free to refuse to take part in the study or to withdraw from it at any stage on simple request. Patients were advised that refusing to participate or withdrawing from the study would not produce consequences or any alteration to the medical care provided.
: Not applicable.
: The authors declare that they have no competing interests.
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