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.