METHODS
A cross‐sectional study was carried out in a tertiary children’s
Hospital following all principles described in the Declaration of
Helsinki. The study was approved by the Hospital Research Ethics
Committee (R-0031/14). All legal guardians and patients over 12 years
signed informed consent to participate in the study. The Strengthening
the Reporting of Observational Studies in Epidemiology (STROBE)
Statement was used as a reference to draft the manuscript.