الإتاحة: https://jdc.jefferson.edu/rothman_institute/200Testhttps://jdc.jefferson.edu/cgi/viewcontent.cgi?article=1200&context=rothman_instituteTest
الإتاحة: https://doi.org/10.4103/2319-2585.145604Testhttps://doaj.org/article/fb74344c72784aa292995d9b37384d44Test
الإتاحة: http://psasir.upm.edu.my/id/eprint/17545Test/http://psasir.upm.edu.my/id/eprint/17545/1Test/U.pdfhttp://emj.bmj.comTest/
URL: http://psasir.upm.edu.my/id/eprint/17545/1Test/U.pdfhttp://psasir.upm.edu.my/id/eprint/17545Test/http://emj.bmj.comTest/http://psasir.upm.edu.my/id/eprint/17545Testhttp://emj.bmj.comTest10.1136/emj.2008.064972