| Study | Reason for exclusion |
|---|---|
| Aus. Safety Reg 2011 | Review |
| Bartlett 2000 | Review |
| Bein 2011 | Retrospective cohort study |
| Benzing 1997 | Prospective cohort study |
| Bonastre 2012 | Prospective, observational, multi‐centre study |
| Crucean 2010 | French report of the Peek 2009 results |
| Cypel 2010 | Conference paper of a prospective non‐randomized trial |
| Gille 1974 | Comparative study |
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