title: Three ages of global health assistance.
authors.affiliation: Mailman School of Public Health, Columbia University, New York, NY, USA. hmg1@columbia.edu.
authors.forename: Henry
authors.initials: H
authors.lastname: Greenberg
mesh_terms: D003695:Delivery of Health Care; D014943:Global Health; D006801:Humans; D007390:International Agencies