| No. | Reference No. | Brief Description | Reason for Exclusion |
| 1 | Brady 2014 [44], Brady 2015 [45] | Two proceedings reporting identical content; [44] retained temporarily. Later matched to Cassidy et al., 2015 [29] with nearly identical authors and study population but different outcome; insufficient data in proceeding to extract effect estimates. | Duplicate content; insufficient data |
| 2 | Kosaka 2011 [46], Kosaka 2012 [32] |
Two proceedings with identical content; [47] retained temporarily. Subsequently published as [32] by overlapping authors with similar population and outcomes. | Duplicate content; subsequent peer-reviewed publication |
| 3 | Cassidy 2012 [48] | Compared an intervention outside the scope of the review. | Irrelevant intervention |