https://cran.r-universe.dev/SurvSProhttps://cran.r-universe.dev/api/packages/SurvSProhttps://cran.r-universe.dev/SurvSPro/SurvSPro.pdfhttps://cran.r-universe.dev/SurvSPro/doc/manual.htmlhttps://cran.r-universe.dev/SurvSPro/citationhttps://cran.r-universe.dev/SurvSPro/citation.txthttps://cran.r-universe.dev/SurvSPro/citation.cff