Gallstone ileus, an uncommon cause of bowel obstruction A. García-Marín, M. Pérez-López, S. Pérez-Bru, A. Compañ-Rosique

Perinatal factors associated with the development of cow's milk protein allergy E.M. Toro Monjaraz, J.A. Ramírez Mayans, R. Cervantes Bustamante, E. Gómez Morales, A. Molina Rosales, E. Montijo Barrios, F. Zárate Mondragón, J. Cadena León, M. Cazares Méndez, M. López-Ugalde

Antibiotic-associated diarrhea: Clinical characteristics and the presence of Clostridium difficile A. Rodríguez-Varón, O.M. Muñoz, J. Pulido-Arenas, S.B. Amado, M. Tobón-Trujillo