Continuing social disparities despite upward trends in sexual and reproductive health service use among young women in the United States. Hall, K. S.; Moreau, C.; Trussell, J.. Contraception. 2012; 681-6: p.681-6. doi:S0010-7824(12)00262-4 [pii] 10.1016/j.contraception.2012.05.013Article