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الإتاحة: https://doi.org/10.1093/gerona/gls151Testhttp://biomedgerontology.oxfordjournals.org/cgi/content/short/68/3/293Test
الإتاحة: https://doi.org/10.1093/rheumatology/kes199Testhttp://rheumatology.oxfordjournals.org/cgi/content/short/51/10/1735Test
الإتاحة: https://doi.org/10.1093/gerona/gls151Testhttp://biomedgerontology.oxfordjournals.org/cgi/content/short/gls151v1Test
الإتاحة: https://doi.org/10.1093/ije/dym269Testhttps://boris.unibe.ch/27635/1/Reichenbach%20IntJEpidemiol%202008.pdfTesthttps://boris.unibe.ch/27635Test/
الإتاحة: https://doi.org/10.1093/ofid/ofx167Testhttp://nrs.harvard.edu/urn-3:HUL.InstRepos:34492432Test
الإتاحة: http://nrs.harvard.edu/urn-3:HUL.InstRepos:14351069Test