Upper-middle-income economies
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Kostova, D., Ross, H., Blecher, E.H. et al. 2010
Centers for Disease Control and Prevention 2010
Heydari, G., Tafti, S.F., Telischi, F. et al. 2010
Waters, H., Sáenz de Miera, B., Ross, H. et al. 2009
European Commission 2009
Bilgic, A., Florkowski, W.J., Abbay, C. 2009