title: Regulatory hierarchies.
authors.forename: R K
authors.initials: RK
authors.lastname: Oldham
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000188:drug therapy; D004345:Drug Industry / Q000191:economics; D015507:Drugs, Investigational / Q000627:therapeutic use*; D005060:Europe; D006076:Government; D006801:Humans; D012106:Research / Q000191:economics; D014481:United States; D014486:United States Food and Drug Administration
chemical_list: D015507:Drugs, Investigational