| Date | Event | Description |
|---|---|---|
| 21 July 2017 | Amended | Typo corrected: Schwaberger 2015 used near‐infrared spectroscopy (NIRS) not a numerical rating scale (NRS). |
| 13 June 2017 | New search has been performed | We updated searches in 2017 and found six new eligible studies for inclusion |
| 13 June 2017 | New citation required but conclusions have not changed | We included six new studies but made no changes to the main conclusions |
| 6 July 2015 | Amended | We updated review author affiliation |
| 10 July 2008 | Amended | We converted the review to new review format |
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