الإتاحة: https://doi.org/10.1136/jnnp-2019-321774Testhttp://jnnp.bmj.com/cgi/content/short/91/3/298Test
الإتاحة: https://doi.org/10.1016/s1474-4422Test(18)30145-5https://api.elsevier.com/content/article/PII:S1474442218301455?httpAccept=text/xmlTesthttps://api.elsevier.com/content/article/PII:S1474442218301455?httpAccept=text/plainTest
الإتاحة: https://doi.org/10.1016/S1474-4422Test(18)30145-5http://nrs.harvard.edu/urn-3:HUL.InstRepos:37298417Test