1. Reynolds-Wright J, Woldetsadik M, Morroni C, Cameron S. Pain management for medication abortion before 14 weeks' gestation. Contraception 2002; Article in press. https://www.contraceptionjournal.org/article/S0010-7824(22)00226-8/fulltext.
2. Cochrane Fertility Regulation. Abortion prioritization 2019. downloaded 9.16.2022 www.fertility-regulation.cochrane.org/projects/abortion-prioritization.
3. Unintended pregnancy and abortion by income, region, and the legal status of abortion: estimates from a comprehensive model for 1990-2019;Bearak;Lancet Glob Health,2020
4. The World Health Organization. Abortion care guidelines. Geneva: World Health Organization, 2022. https://www.who.int/publications/i/item/9789240039483 downloaded 9/16/2022.
5. Cochrane handbook for systematic reviews of interventions;Higgins,2019