E. Martin-Alva, F. Chávez, and P. Mercado, “Association of Clostridium difficile, its toxin A and histopathological damage in patients with nosocomial diarrhea”, Rev peru biol, vol. 14, no. 2, pp. 287–290, Dec. 2007, doi: 10.15381/rpb.v14i2.1808.