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Backman T, Huhtala S, Tuominen J, et al. Sixty thousand woman-years of experience on the levonorgestrel intrauterine system: an epidemiological survey in Finland. Eur J Contracept Reprod Health Care. 2001;6:23-6doi: 10.3109/ejc.6.s1.23.26.
Backman, T., Huhtala, S., Tuominen, J., Luoto, R., Erkkola, R., Blom, T., Rauramo, I., & Koskenvuo, M. (2001). Sixty thousand woman-years of experience on the levonorgestrel intrauterine system: an epidemiological survey in Finland. The European journal of contraception & reproductive health care : the official journal of the European Society of Contraception, 623-6. https://doi.org/10.3109/ejc.6.s1.23.26
Backman, T, et al. "Sixty thousand woman-years of experience on the levonorgestrel intrauterine system: an epidemiological survey in Finland." The European journal of contraception & reproductive health care : the official journal of the European Society of Contraception vol. 6 (2001): 23-6. doi: https://doi.org/10.3109/ejc.6.s1.23.26
Backman T, Huhtala S, Tuominen J, Luoto R, Erkkola R, Blom T, Rauramo I, Koskenvuo M. Sixty thousand woman-years of experience on the levonorgestrel intrauterine system: an epidemiological survey in Finland. Eur J Contracept Reprod Health Care. 2001;6:23-6. doi: 10.3109/ejc.6.s1.23.26. PMID: 25104511.
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