1.
Bull. Pan Am. Health Organ
;
26(2): 192-200, 1992.
Article
in English
| LILACS
| ID: lil-371080
2.
Bol. Oficina Sanit. Panam
;
113(4): 281-289, 1992.
Article
in Spanish
| LILACS
| ID: lil-370554