1. Migration Policy Institute. US Immigrant population and share over time, 1850-present. https://www.migrationpolicy.org/programs/data-hub/charts/immigrant-population-over-time. Accessed 6 June 2020.
2. International Organization for Migration (IOM). World migration report 2020. https://publications.iom.int/books/world-migration-report-2020. Accessed 6 June 2020.
3. Almeida LM, Caldas J, Ayres-de-Campos D, Salcedo-Barrientos D, Dias S. Maternal healthcare in migrants: a systematic review. Matern Child Health J. 2013;17(8):1346–54.
4. Van den Akker T, Van Roosmalen J. Maternal mortality and severe morbidity in a migration perspective. Best Pract Res Clin Obstet Gynaecol. 2016;32:26–38.
5. Salihu HM, Mardenbrough-Gumbs WS, Aliyu MH, Sedjro JE, Pierre-Louis BJ, Kirby RS, et al. Influence of nativity on neonatal survival of Black twins in the United States. Ethn Dis. 2005;15(2):276–82.