@article{Alkema2013,
author = {Alkema, L. and Kantorová, V. and Menozzi, C. and Biddlecom, A.},
title= {National, regional, and global rates and trends in contraceptive prevalence and unmet need for family planning between 1990 and 2015: A systematic and comprehensive analysis},
year = {2013},
doi = {10.1016/S0140-6736(12)62204-1},
volume = {381},
number = {9878},
pages = {1642--1652},
}