共 15 条
[1]
ARMITAGE P, 1971, STATISTICAL METHODS
[2]
BURKMAN RT, 1981, OBSTET GYNECOL, V57, P269
[3]
INTRAUTERINE-DEVICES AND ACUTE PELVIC INFLAMMATORY DISEASE
[J].
JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION,
1976, 235 (17)
:1851-1853
[5]
BARRIER-METHOD CONTRACEPTIVES AND PELVIC INFLAMMATORY DISEASE
[J].
JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION,
1982, 248 (02)
:184-187
[6]
MANTEL N, 1959, J NATL CANCER I, V22, P719
[7]
MANTEL N, 1963, J AM STAT ASSOC, V58, P690
[10]
SLONE D, 1977, EPIDEMIOLOGICAL EVAL