Barriers and facilitators to retaining a cohort of street-based cisgender female sex workers recruited in Baltimore, Maryland, USA: results from the SAPPHIRE study by Bradley E. Silberzahn, Miles B. Morris, Katelyn E. Riegger, Rebecca Hamilton White, Catherine A. Tomko, Ju Nyeong Park, Katherine H.A. Footer, Steven S. Huettner, Susan G. Sherman

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