Anastrozole or letrozole for ovulation induction in clomiphene-resistant women with polycystic ovarian syndrome: a prospective randomized trial
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PII: S0015-0282(07)01038-2
doi:10.1016/j.fertnstert.2007.05.010
© 2008 American Society for Reproductive Medicine. Published by Elsevier Inc. All rights reserved.

