1.
Univ. med
; 43(3): 189-200, 2002. ilus, tab
Article
in Spanish
| LILACS
| ID: lil-346777
2.
Rev. colomb. gastroenterol
; 14(3): 143-163, jul.-sept. 1999. ilus, graf
Article
in Spanish
| LILACS
| ID: lil-358968