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中华医学会.临床诊疗指南·辅助生殖技术与精子库分册[M].北京:人民卫生出版社, 2007：46 ．。Elnashar A, Fouad H，Eldosoky M，et al ． Letro zole induction of ovulation in women with clomi phene citrate‐resistant polycystic ovary syndrome may not depend on the period of infertility，the body mass index。Mitwally MFM, Casper RF ． Use of an aromatase inhibitor for induction of ovulation in patients with an inadequate response to clomiphene cit rate ［ J ］ ． Fertil Steril，2001，75.