http://europepmc.org/articles/PMC3623019?pdf=render
Europe PMC
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http://www.researchgate.net/profile/Bernadette_Ohare2/publication/236604671_View_point_Economic_growth_and_child_health_in_Sub_Saharan_Africa/links/55368a780cf268fd00186f72.pdf
ResearchGate
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http://www.ajol.info/index.php/mmj/article/download/85669/75584
ajol.info
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//xueshu.baidu.com/s?wd=paperuri%3A%28f1dfaa2fba15589e8b589857b31a3ef5%29&filter=sc_long_sign&tn=SE_xueshusource_2kduw22v&sc_vurl=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fpmc%2Farticles%2FPMC3623019%2Fpdf%2FMMJ2404-0087.pdf&ie=utf-8&sc_us=17064249748252102164
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