1.
Bol. Oficina Sanit. Panam
;
113(1): 1-18, 1992. tab
Article
in Spanish
| LILACS
| ID: lil-370413
2.
Bull. W.H.O. (Online)
;
68(2): 209-215, 1990.
Article
in English
| AIM
| ID: biblio-1259754