1.
Bol. Oficina Sanit. Panam
; 113(2): 97-108, ago. 1992. tab
Article
in Spanish
| LILACS
| ID: lil-370472
2.
Bull. Pan Am. Health Organ
; 26(1): 47-59, 1992. tab
Article
in English
| LILACS
| ID: lil-371033