Prospective Parallel Randomized, Double-Blind, Double-Dummy Controlled Clinical Trial Comparing Clomiphene Citrate and Metformin as the First-Line Treatment for Ovulation Induction in Nonobese Anovulatory Women with Polycystic Ovary SyndromeStefano Palomba, Fulvio Zullo, Enrico Carmina et al.|The Journal of Clinical Endocrinology & Metabolism|2005Cited by 280