共 21 条
[12]
INGEMARSSON I, 1978, LANCET, V2, P172
[13]
Kauppila O, 1975, Acta Obstet Gynecol Scand Suppl, V39, P1
[18]
OLEARY JA, 1979, OBSTET GYNECOL, V53, P341
[20]
TODD WD, 1963, OBSTET GYNECOL, V22, P583