National Center for Biotechnology Information NCBI NLM MEDLINE financing review humans pubmed abstract nih national institutes of health national library of medicine research support non-u.s. gov't adult female male adolescent middle aged young adult Child Infant newborn preschool government poverty areas africa south of the sahara / epidemiology nutritional status* public policy pmid:22380980 pmc2903773 doi:10.1080/09540120903112351 m adato l bassett acquired immunodeficiency syndrome / economics acquired immunodeficiency syndrome / epidemiology* education* / economics hiv seropositivity / economics hiv seropositivity / epidemiology* health services accessibility* / economics health services accessibility* / statistics & numerical data medical assistance* / economics social welfare