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APA Citation
Polis, C. B., Phillips, S. J., Hillier, S. L., & Achilles, S. L. (2016). levonorgestrel in contraceptives and multipurpose prevention technologies: does this progestin increase HIV risk or interact with antiretrovirals?. AIDS, 30, 2571–2576. http://access.bl.uk/ark:/81055/vdc_100052392154.0x00001b