共 20 条
[2]
BECK P, 1979, OBSTET GYNECOL, V53, P653
[6]
Hansen K B, 1974, Ugeskr Laeger, V136, P1961
[7]
Hansen P, 1980, Ugeskr Laeger, V142, P438
[8]
Hejl B L, 1980, Ugeskr Laeger, V142, P436
[9]
HERNANDEZ IM, 1977, OBSTET GYNECOL, V50, P356
[10]
Larsen J F, 1980, Ugeskr Laeger, V142, P467