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Recombinant versus urinary gonadotrophin for ovarian stimulation in assisted reproductive technology cycles. A Cochrane review.

Several systematic reviews compared recombinant gonadotrophin with urinary gonadotrophins (HMG, purified FSH and highly purified FSH) for ovarian hyperstimulation in IVF and ICSI cycles and these reported conflicting results. Each of these reviews used different inclusion and exclusion criteria for trials. Our aim in producing this review was to bring together all randomized studies in this field under common inclusion criteria with consistent and valid statistical methods.