Good health at low cost 25 years on: Lessons for the future of health systems strengthening - Balabanova, D; Mills, A; Conteh, L; Akkazieva, B; Banteyerga, H; Dash, U; Gilson, L; Harmer, A; Ibraimova, A; Islam, Z; Kidanu, A; Koehlmoos, T; et al. (Lancet, 2013)