The cost and cost drivers of delivering COVID-19 vaccines in low- and middle-income countries: a bottom-up costing study of rollouts in seven countries - Flavia Moi; Van Minh Nguyen; Rachel Archer; Tozé Namalela; Christina Banks; Tarek Hossain; Afroja Yesmin; Cathbert Tumusiime; Charlotte Muheki; Kelsey Vaughan; Elise Smith; Rafael Deo Estanislao; et al. (PLoS ONE, 2026)