1.
Bol. Oficina Sanit. Panam
;
112(5): 413-424, mayo 1992. tab
Article
in Spanish
| LILACS
| ID: lil-370400
2.
Bull. Pan Am. Health Organ
;
26(1): 67-79, 1992. tab
Article
in English
| LILACS
| ID: lil-371035