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  • Tse T, Zarin D, Williams R, Ide N. The role and importance of clinical trial registries and results databases In: Gallin JI, Ognibene FP, eds, Principles and Practice of Clinical Research. 3rd ed. Amsterdam: Academic Press; 2012: 171-81.
  • Callaghan FM. Tutorial: Biostatistics 101: introduction to power and sample size.
  • Williams RJ. Tutorial: ClinicalTrials.gov: Registration and Results Submission Requirements

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