Received: 13 November 2017
Accepted: 9 April 2018
First Online: 3 July 2018
Ethics approval and consent to participate
: The protocol of the study was approved by the Ethics Committee (IRB) of the Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán (NER 332). All patients signed an informed consent before testing.
: The authors declare that they have no competing interests.
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