1.
Bol. epidemiol. Antioq
;
12(1): 71-2, ene.-mar. 1987.
Article
in Spanish
| LILACS
| ID: lil-71890
2.
Bol. epidemiol. Antioq
;
11(3): 168-9, jul.-sept. 1986.
Article
in Spanish
| LILACS
| ID: lil-71860