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APA Citation
Bastu, E., Buyru, F., Ozsurmeli, M., Demiral, I., Dogan, M., & Yeh, J. (n.d.). a randomized, single-blind, prospective trial comparing three different gonadotropin doses with or without addition of letrozole during ovulation stimulation in patients with poor ovarian response. European journal of obstetrics, gynecology, and reproductive biology, 203, 30–34. http://access.bl.uk/ark:/81055/vdc_100070059075.0x000017