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What the full amendment history of ClinicalTrials.gov shows, and how to work with it.

• ClinicalTrials.gov version history, for every trial at onceHow record versions work, what changes between them, and how to analyze them across the registry.
• How often clinical trial completion dates slip46.9% of interventional trials have pushed back their primary completion date at least once. Slippage by sponsor type.
• How to cite Anamnesis DataBibTeX and plain-text citations, and how to credit ClinicalTrials.gov.