Inclusion Criteria:  Children and adolescents volunteers (2-18 years old). Regular gluten consumption. Willingness to perform the study and ability to collect urine samples. The signing of the informed consent by the volunteer and his/her legal guardians.  Exclusion Criteria:  Related diseases or psychiatric alterations which do not recommend being included in the study as the researcher's consideration. Lack of foreseeable collaboration. Patients which do not provide samples or surveys in 70% of cases.