1.
Lima; Organización Panamericana de la Salud; abr. 1993. 17 p.
Monography
in Spanish
| LILACS
| ID: lil-371324
2.
Washington, D.C; Pan Américan Health Organization; May 1992. 23 p. ilus.
Monography
in English
| LILACS
| ID: lil-371131