共 23 条
[2]
BLANCHET J, 1967, CAN MED ASSOC J, V96, P71
[3]
BONE M, 1973, FAMILY PLANNING SERV
[5]
HARRALSON JD, 1972, AM J OBSTET GYNECOL, V115, P995
[6]
Jones D H, 1966, Br J Clin Pract, V20, P377
[8]
LOGAN WPD, 1958, STUDIES MEDICAL POPU, V14
[9]
MALKASIAN GD, 1958, J AM MEDICAL ASSOC, V168, P987
[10]
NEWTON J, 1972, LANCET, V2, P951