title: Non-specific effects of vaccines: RCTs, not observational studies, are needed.
authors: Andrew J
authors: AJ
authors: Pollard
mesh_terms: D035843:Biomedical Research; D003906:Developing Countries; D005260:Female; D006801:Humans; D007223:Infant; D007226:Infant Mortality / Q000639:trends; D008297:Male; D016032:Randomized Controlled Trials as Topic; D012737:Sex Factors; D014612:Vaccines / Q000009:adverse effects / Q000276:immunology*
chemical_list: D014612:Vaccines