https://sth1402.r-universe.dev/dtrSurvhttps://sth1402.r-universe.dev/api/packages/dtrSurvhttps://sth1402.r-universe.dev/dtrSurv/dtrSurv.pdfhttps://sth1402.r-universe.dev/dtrSurv/doc/manual.htmlhttps://sth1402.r-universe.dev/dtrSurv/NEWShttps://sth1402.r-universe.dev/dtrSurv/NEWS.txthttps://sth1402.r-universe.dev/dtrSurv/citationhttps://sth1402.r-universe.dev/dtrSurv/citation.txthttps://sth1402.r-universe.dev/dtrSurv/citation.cff