https://qihongchao.r-universe.dev/SampleSize4ClinicalTrialshttps://qihongchao.r-universe.dev/api/packages/SampleSize4ClinicalTrialshttps://qihongchao.r-universe.dev/SampleSize4ClinicalTrials/SampleSize4ClinicalTrials.pdfhttps://qihongchao.r-universe.dev/SampleSize4ClinicalTrials/doc/manual.htmlhttps://qihongchao.r-universe.dev/SampleSize4ClinicalTrials/citationhttps://qihongchao.r-universe.dev/SampleSize4ClinicalTrials/citation.txthttps://qihongchao.r-universe.dev/SampleSize4ClinicalTrials/citation.cff