Text and Data Mining valid from 2020-02-10
Received: 3 August 2019
Accepted: 30 January 2020
First Online: 10 February 2020
Ethics approval and consent to participate
: The study was approved by the research and ethics boards of the Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán. All experiments were performed in compliance with relevant laws, institutional guidelines and by the ethical standards of the Declaration of Helsinki. Being a retrospective study, based on non-identifiable archived data, informed consent was not requested.
: Not applicable.
: The authors declare that they have no competing interests.