1.
Bol. Oficina Sanit. Panam
;
112(5): 406-412, mayo 1992. tab
Article
in Spanish
| LILACS
| ID: lil-370399
2.
Bull. Pan Am. Health Organ
;
26(2): 121-127, 1992. tab
Article
in English
| LILACS
| ID: lil-371074