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8دورية أكاديمية
الإتاحة: https://doi.org/10.15690/vsp.v21i3.2426Test
https://doi.org/10.1136/bmj.328.7430.39Test
https://doi.org/10.1159/000052882Test
https://doi.org/10.1097/01.ju.0000173640.91654.b5Test
https://doi.org/10.1136/bmj.38250.571088.55Test
https://doi.org/10.1093/aje/kwi042Test
https://doi.org/10.1097/EDE.0b013e3181577654Test
https://doi.org/10.1136/oem.57.1.1Test
https://doi.org/10.1097/00001648-199001000-00010Test
https://doi.org/10.1371/journal.pmed.0040028Test -
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