共 8 条
[1]
BREEN JL, 1968, OBSTET GYNECOL, V32, P419
[4]
GOPLERUD J, 1953, OBSTET GYNECOL, V1, P59
[5]
GRUIKSHANK DP, 1973, AM J OBSTET GYNECOL, V116, P1097
[6]
JOHNSON CE, 1964, JAMA-J AM MED ASSOC, V187, P642
[8]
WEISSBERG SM, 1973, OBSTET GYNECOL, V41, P60