1.
Bol. méd. Hosp. Infant. Méx
;
45(6): 407-9, jun. 1988.
Article
in Spanish
| LILACS
| ID: lil-69608
2.
Bol. Oficina Sanit. Panam
;
104(2): 197-200, feb. 1988.
Article
in Spanish
| LILACS
| ID: lil-367025