Department of Gastroenterology;
Faculty ofMedicine;
Pontificia Universidad Católica de Chile;
Marcoleta367;
Santiago 6510260;
Chile;
Department of Public Health;
Faculty of Medicine;
Pontificia Universidad Católica de Chile;
Marcoleta 367;
Santiago 6510260;
Chile;
Department of Pediatrics;
Faculty of Medicine;
Pontificia Universidad Católica de Chile;
Marcoleta 367;
Santiago 6510260;
Chile;
Department of Pathology;
Faculty of Medicine;
Pontificia Universidad Católica de Chile;
Marcoleta 367;
Santiago 6510260;
Chile;