1. Recombinant Follicle-Stimulating Hormone (Follitropin Beta, Puregon) Yields Higher Pregnancy Rates in In Vitro Fertilization than Urinary Gonadotropins 
Henk J Out, Stefan G.A.J Driessen, Bernadette M.J.L Mannaerts, Herjan J.T Coelingh Bennink 
Fertility and Sterility 
Volume 69, Issue 2, Pages 40S-44S (February 1998)
DOI: /S (97)

2. Fig. 1
Ongoing pregnancy rates (%) after controlled ovarian hyperstimulation, IVF, and fresh ET with recombinant FSH (recFSH) and urinary FSH (uFSH) or hMG as assessed in 25 centers involved in three comparative, randomized clinical trials.
Fertility and Sterility  , 40S-44SDOI: ( /S (97) )