https://guangl10.r-universe.dev/PPCSexRxhttps://guangl10.r-universe.dev/api/packages/PPCSexRxhttps://guangl10.r-universe.dev/PPCSexRx/PPCSexRx.pdfhttps://guangl10.r-universe.dev/PPCSexRx/doc/manual.htmlhttps://guangl10.r-universe.dev/PPCSexRx/citationhttps://guangl10.r-universe.dev/PPCSexRx/citation.txthttps://guangl10.r-universe.dev/PPCSexRx/citation.cffhttps://guangl10.r-universe.dev/PPCSexRx/doc/PPCSexRx.Rmdhttps://guangl10.r-universe.dev/articles/PPCSexRx/PPCSexRx.html