1.
Bol. epidemiol. Antioq
;
13(2): 256-64, abr.-jun. 1988.
Article
in Spanish
| LILACS
| ID: lil-68560
2.
Bol. epidemiol. Antioq
;
13(2): 265-8, abr.-jun. 1988.
Article
in Spanish
| LILACS
| ID: lil-68561