共 18 条
[3]
DAVIS ME, 1970, OBSTET GYNECOL, V36, P187
[4]
HELGASON S, 1982, ACTA OBSTET GYN SCAN, P1
[5]
HOLZMAN GB, 1984, OBSTET GYNECOL, V63, P303
[7]
LANE HU, 1987, WORLD ALMANAC BOOK F
[9]
LINDSAY R, 1976, LANCET, V1, P1038
[10]
LUCIANO AA, 1988, OBSTET GYNECOL, V71, P39