共 28 条
[3]
FACTORS GOVERNING IUD PERFORMANCE
[J].
AMERICAN JOURNAL OF PUBLIC HEALTH AND THE NATIONS HEALTH,
1971, 61 (03)
:559-&
[4]
Frampton J, 1967, Br J Clin Pract, V21, P289
[6]
HILL AM, 1969, AM J OBSTET GYNECOL, V103, P200
[7]
HOWARD G, 1972, LANCET, V2, P1339
[8]
JENNINGS P N, 1969, New Zealand Medical Journal, V69, P27
[9]
LANCASTER HO, 1969, CHISQUARED DISTRIBUT, pCH12
[10]
LEDGER WJ, 1966, OBSTET GYNECOL, V28, P806