共 12 条
[2]
CLAMAN AD, 1964, AM J OBSTET GYNECOL, V90, P350
[5]
McIlwaine G M, 1974, Health Bull (Edinb), V32, P103
[6]
MCILWAINE GM, 1979, SCOTLAND 1977 PERINA, P10
[7]
STEARN RH, 1963, LANCET, V2, P1083
[8]
UNDERHILL R, 1978, J MATERN CHILD HLTH, V3, P404
[10]
1971, BRIT MED J, V2, P602