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Levonorgestrel–releasing intra–uterine systems (LNG-IUS) an..:

Neven, Patrick ; Amant, Frederik ; Poppe, Willy.
Fertility and Sterility.  91 (2009)  4 - p. e5 , 2009
Link: https://doi.org/10.1016/j.fertnstert.2008.12.067