共 28 条
[22]
Sackett DL, 1991, CLIN EPIDEMIOLOGY BA
[23]
SNOWDEN EU, 1984, FERTIL STERIL, V41, P709
[24]
SWOLIN K, 1972, FERTIL STERIL, V23, P270
[25]
TAYLOR PJ, 1977, J REPROD MED, V18, P339
[26]
WATSON A, 1994, FERTIL STERIL, V61, P470
[27]
1989, SAS STAT USERS GUIDE, V1
[28]
1986, FERTIL STERIL, V46, P1101