Text and Data Mining valid from 2019-12-01
Received: 12 August 2019
Accepted: 14 November 2019
First Online: 11 December 2019
Ethics approval and consent to participate
: The study protocol was approved by the ethics committee of Hospital Infantil de México Federico Gómez (register number HIM/069/2010), including a parental consent.
: Not applicable.
: The authors declare that they have no competing interests.