DOI:
10.1055/s-00000020
Geburtshilfe und Frauenheilkunde
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References
Alkema L, Kantorova V, Menozzi C. et al.
National, regional, and global rates and trends in contraceptive prevalence and unmet need for family planning between 1990 and 2015: a systemic and comprahensive analysis.
Lancet 2013;
381: 1642-1652
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