1. Soundbites: review;Chantler;BMJ,1998
2. American Association of Oral and Maxillofacial Surgeons. OMS procedures. Available from URL: https://www.aaoms.org/education-research/dental-students/oms-procedures. (last accessed 19 January 2020).
3. Should wrong extraction site be classed as a never event?;Sampson;Br Dent J,2018
4. NHS Improvement. Patient safety. Available from URL: https://improvement.nhs.uk/improvement-hub/patient-safety. (last accessed 19 January 2020).
5. World Health Organization. Patient safety. Available from URL: http://www.who.int/patientsafety/en/. (last accessed 19 January 2020).