RT Journal Article SR Electronic T1 Grading the quality of evidence in complex interventions: a guide for evidence-based practitioners JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 20 OP 22 DO 10.1136/ebmed-2016-110577 VO 22 IS 1 A1 M Hassan Murad A1 Jehad Almasri A1 Mouaz Alsawas A1 Wigdan Farah YR 2017 UL http://ebm.bmj.com/content/22/1/20.abstract AB