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APA Citation
Fan, G. S., Ren, M., Di, W., Su, P., Chang, Q., Wu, S., Qin, Y., Korver, T., Marintcheva-Petrova, M., Yacik, C., McCrary Sisk, C., & Wang, G. (n.d.). efficacy and safety of the contraceptive vaginal ring (NuvaRing) compared with a combined oral contraceptive in Chinese women: a 1-year randomised trial. European journal of contraception & reproductive health care, 21, 303–309. http://access.bl.uk/ark:/81055/vdc_100034566134.0x000017