Small Bowel Section;
Department of Medicine;
Dr. C. Bonorino Udaondo Gastroenterology Hospital;
Department of Immunology;
Biomedal S.L.;
Farncombe Family Digestive Health Research Institute;
McMaster University;
Research Institutes;
Universidad del Salvador;
Celiac; disease; Follow-up; Gluten-free; diet; Gluten; immunogenic; peptide; excretion; Rapid; tests;