الإتاحة: https://doi.org/10.1001/jamanetworkopen.2018.1456Testhttp:///jamanetworkopen/article-pdf/1/4/e181456/17306816/pellikka_2018_oi_180093.pdfTest
الإتاحة: https://doi.org/10.1001/jamacardio.2016.5492Testhttps://jamacardiology.jamanetwork.com/ama/content_public/journal/cardiology/936245/jamacardiology_pai_2017_ld_160022.pdfTest
الإتاحة: https://doi.org/10.1001/jama.1984.03340340044026Testhttp://jamanetwork.com/journals/jama/fullarticle/391834Test