Received: 12 October 2017
Accepted: 22 January 2018
First Online: 5 February 2018
Ethics approval and consent to participate
: Informed consent was obtained from all patients’ parents or guardians. Ethical approval of the study protocol was obtained from the Human Research Ethics Committee of the Institute of Biosciences, USP.
: All authors commented on and approved the manuscript.
: The authors declare that they have no competing interests.
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