共 5 条
[1]
Antia-Obong O. E., 1991, Nigerian Journal of Paediatrics, V18, P94
[3]
ORUAMABO R S, 1986, Nigerian Journal of Paediatrics, V13, P115
[4]
STANFIELD JP, 1984, B WORLD HEALTH ORGAN, V62, P647
[5]
WHO, 1993, WHOEPITRAM933, P9