Estimated economic impact of vaccinations in 73 low- and middle-income countries, 2001-2020 - Ozawa, S; Clark, S; Portnoy, A; Grewal, S; Stack, ML; Sinha, A; Mirelman, A; Franklin, H; Friberg, IK; Tam, Y; Walker, N; Clark, A; et al. (Bulletin of the World Health Organization, 2017)