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Methodological context for: Bell JA (1941). Pertussis prophylaxis with two doses of alum-precipitated vaccine. Public Health Reports 56:1535-1546.
- Allocation bias
- Differences between the people compared
- Intention-to-treat
- Differences between the people compared
- Observer bias
- Differences in the way treatment outcomes are assessed
- Play of chance
- Taking account of the play of chance