1. Department of Immunology and Rheumatology, National Institute of Medical Sciences and Nutrition, Vasco de Quiroga No. 15, Colonia Sección XVI, 14000 Mexico City, DF, Mexico
2. Department of Pathology, National Institute of Medical Sciences and Nutrition, Vasco de Quiroga No. 15, Colonia Sección XVI, 14000 Mexico City, DF, Mexico
3. Department of Gastroenterology, National Institute of Medical Sciences and Nutrition, Vasco de Quiroga No. 15, Colonia Sección XVI, 14000 Mexico City, DF, Mexico
4. Department of Experimental Surgery, National Institute of Medical Sciences and Nutrition, Vasco de Quiroga No. 15, Colonia Sección XVI, 14000 Mexico City, DF, Mexico