共 23 条
[1]
[Anonymous], ETHIOP J HLTH DEV
[2]
[Anonymous], 1980, Foundations of epidemiology
[3]
BERHANE Y, 1999, AFR J REPROD HEALTH, V3, P33
[5]
Faveau V, 1988, B WORLD HEALTH ORGAN, V66, P643
[7]
GRAHAM W, 1988, LANCET, V1, P416
[9]
GREENWOOD AM, 1987, B WORLD HEALTH ORGAN, P65635
[10]
HOGBERG U, 1994, OBSTET GYNECOL, V84, P240