共 20 条
[11]
NELSON KB, 1981, PEDIATRICS, V68, P36
[13]
Saling E, 1967, J Obstet Gynaecol Br Commonw, V74, P799
[14]
SYKES GS, 1982, LANCET, V1, P494
[15]
WEBER T, 1979, DAN MED BULL, V26, P186
[16]
WILSON RW, 1980, OBSTET GYNECOL, V55, P653
[20]
1980, 2ND SOC SERV COMM PE