- The prevalence of autism continues to rise, and no clear reason for
this increase is known.
- The case series analysis allows for study of rare events without
a cohort, while allowing similar power. It requires the assumption
that the disease in question is rare.
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Li J, Waight P. Autism and measles, mumps, and rubella vaccine:
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DeStefano F, Chen RT. Negative association between MMR and autism.
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