Text and Data Mining valid from 2019-01-03
Received: 6 November 2018
Accepted: 16 December 2018
First Online: 3 January 2019
Compliance with Ethical Standards
: The authors declare that they have no conflict of interest.
: All procedures performed in this study involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments. The study was approved by the Institutional Research Ethics Committee and performed in accordance with the Brazilian Ethical Review System on research involving human beings
: Written informed consent was obtained from all patients and parents or legal representatives after the procedures had been fully explained and prior to their inclusion in the study; anonymity was assured.