Erratum to: The SABRTooth feasibility trial protocol: a study to determine the feasibility and acceptability of conducting a phase III randomised controlled trial comparing stereotactic ablative radiotherapy (SABR) with surgery in patients with peripheral stage I non-small cell lung cancer (NSCLC) considered to be at higher risk of complications from surgical resection. Issue 1 (December 2016) - Snee, M.; McParland, L.; Collinson, F.; Lowe, C.; Striha, A.; Baldwin, D.; Naidu, B.; Sebag-Montefiore, D.; Gregory, W.; Bestall, J.; Hewison, J.; Hinsley, S.; et al.