Protocol BMC Musculoskelet Disord. 2011 Sep 13;12:201. doi: 10.1186/1471-2474-12-201.

Results BMJ. 2014 Aug 5;349:g4807. doi: 10.1136/bmj.g4807.

HTA Health Technol Assess. 2015 Feb;19(17):1-124, v-vi. doi: 10.3310/hta19170