Santos, A. C., Paim, J. N., Soarez, P. C. D., Cerchiari, N., Magno, L., Dourado, I., Grangeiro, A. (2025). Costs and return to scale analysis of extending the offer of pre-exposure prophylaxis (PrEP) to key populations aged 15–17 years old in two Brazilian cities. PLoS ONE. https://doi.org/10.1371/journal.pone.0332901