الوصول الحر: https://escholarship.org/uc/item/82b3m32wTest
الوصول الحر: https://escholarship.org/uc/item/2253879tTest
الإتاحة: https://doi.org/10.1097/bpo.0000000000001735Test
الإتاحة: https://doi.org/10.1186/1472-6874-12-5Testhttps://doaj.org/article/1f3aa75b5aa74c4a9a8216b76ec5a2beTest
الإتاحة: http://www.biomedcentral.com/1472-6874/12/5Test
الإتاحة: https://doi.org/10.1016/s0140-6736Test(14)62337-0https://api.elsevier.com/content/article/PII:S0140673614623370?httpAccept=text/plainTesthttps://api.elsevier.com/content/article/PII:S0140673614623370?httpAccept=text/xmlTest
الإتاحة: http://hdl.handle.net/10570/1098Test