Department of Gastroenterology;
Complejo Hospitalario de Navarra;
Department of Gastroenterolgy;
Hospital Infanta Leonor;
Department of Digestive Diseases;
Hospital Clinico San Carlos;
Department of Digestive Diseases;
Hospital Clinico San Carlos and Complutense University;
Irritable; bowel; syndrome; Nutrient; drink; test; Non-invasive; Dyspepsia; Screening;