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APA Citation
Nelson, A., Parke, S., Makalova, D., Serrani, M., Palacios, S., & Mellinger, U. (n.d.). efficacy and bleeding profile of a combined oral contraceptive containing oestradiol valerate/dienogest: A pooled analysis of three studies conducted in North America and Europe. European journal of contraception & reproductive health care, 18, 264–273. http://access.bl.uk/ark:/81055/vdc_100024482569.0x00002a