| Study | Reason for exclusion |
|---|---|
| Bobrow 2010 | Prospective observational cohort study |
| Bohm 2007 | Retrospective investigation study |
| Cabrini 2010 | Review |
| Crane 2008 | Prospective observational study |
| Hüpfl 2010 | Review |
| Kitamura 2010 | Prospective observational cohort study |
| Ong 2008 | Prospective cohort study |
| Sayre 2008 | Review |
| Swor 2003 | Mannequin study |
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