الإتاحة: https://doi.org/10.1007/s00134-016-4633-8Testhttp://hdl.handle.net/11585/631974Test
الإتاحة: https://doi.org/10.1093/bja/aew316Testhttp://hdl.handle.net/11383/2076982Testhttp://bja.oxfordjournals.orgTest/