共 11 条
[1]
[Anonymous], 1991, Lancet, V338, P131, DOI 10.1016/0140-6736(91)90133-A
[2]
[Anonymous], 1992, MMWR-MORBID MORTAL W, V41, P1
[4]
Canfield MA, 1996, AM J EPIDEMIOL, V143, P12
[5]
Centers for Disease Control and Prevention (CDC), 1999, MMWR Morb Mortal Wkly Rep, V48, P325
[7]
Hendricks KA, 1999, AM J EPIDEMIOL, V149, P1119
[10]
PERLOW JH, 1999, CONT OB GYN, V44, P39